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A vessel trawling would display______．
A.a black ball
B.a basket
C.a double cone，point to point
D.none of the above
参考答案
更多 “ A vessel trawling would display______．A.a black ballB.a basketC.a double cone，point to pointD.none of the above ” 相关考题
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下面程序的输出结果是【】。include include class point{double x; double y;
下面程序的输出结果是【 】。include ＜iostream.h＞include ＜math.h＞class point{double x;double y;public:point(double a, double b){x=a;y=b;}friend double distance(point a, point b) ;};double distance(point a, point b){return sqrt ((a. x-b.x) * (a. x-b.x)+ (a. y-b. y) * (a. y-b. y) );}void main(){point p1(1,2);point p2(5,2);cout＜＜distance(p1,p2)＜＜end1;}
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阅读下列C++程序和程序说明，将应填入(n)处的字句写在对应栏内。【说明】Point是平面坐标系上的点类，Line是从Point派生出来的直线类。include ＜iostream.h＞class Point{public:Point (int x, int y) ;Point (Point p) ;～Point();void set (double x, double y) ;void print();private:double X,Y;};Point::Point (int x, int y) //Point 构造函数{X=x; Y=y; }Point::Point ( (1) ) //Point 拷贝构造函数{X=p.X; Y=p.Y；}void Point::set (double x, double y){X=x; Y=y; }void Point::print(){cout＜＜' ('＜＜X＜＜","＜＜Y＜＜") "＜＜endl; }Point::～Point(){cout＜＜"Point 的析构函数被调用! "＜＜endl;class Line: public Point{public:Line (int x, int y, int k) ;Line (Line s) ;～Line();void set (double x, double y, double k)void print();private:double K;};(2)//Line 构造函数实现{ K=k;}(3)//Line 拷贝构造函数实现{K=s.K;}void Line::set (double x, double y, double k){ (4);K=k;}void Line::print(){cout＜＜" 直线经过点";(5);cout＜＜"斜率为: k="＜＜K＜＜endl;}Line: :～Line(){cout＜＜"Line 析构函数被调用! "＜＜endl;}void main(){Line 11 (1,1,2) ;11 .print();Linel2 (11) ;12.set (3,2,1) ;12.print();}
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下面程序的输出结果是【】。 inclde include using namespace std; class point {
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下面程序的输出结果是()。includeincludeusing namespace std;class point{p
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下列程序的执行结果为【 】。include class Point{public:Point(double i, double j)
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有以下程序:includeincludeusing namespace std; class point{private:double
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有以下程序:include include using namespace std;class point{private:doubl
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考题
A fishing vessel displaying the lights shown is ______.A.anchoredB.underway but not fishingC.tending a small fishing boatD.fishing by trawling
考题
A vessel would be referred to as "stiff" when the weight of the cargo is ______.A.evenly distributed vertically and the double bottoms are fullB.concentrated low and the double bottoms are emptyC.concentrated low and the double bottoms are fullD.concentrated high and the double bottoms are empty
考题
A vessel engaged in minesweeping on the high seas carries which of the following day signals ?A.Two green balls in a vertical lineB.Two black balls in a vertical lineC.A black ball at the foretruck and yardarm endsD.A shape of two cones point to point
考题
A vessel under sail, displaying a black conical shape, point down, is regarded as ______.A.Power drivenB.SailingC.Not under commandD.Fishing
考题
In the daytime, you see a large sailing vessel on the beam. You know that she is also propelled by machinery if she shows ______.A.a black ballB.a black coneC.two black conesD.a basket
考题
共用题干
Black HolesMost scientists agree that black holes exist but are nearly impossible to locate.A black hole in the universe is not a solid object,like a planet,but it is shaped like a sphere（球体）. Astronomers（天文学家）think that at the center of a black hole there is a single point in space with infinite（无限的）density（稠密）.This single point is called a singularity（奇点）. If the singularity theory is correct,it means that when a massive star collapses,all the material in it disappears into the singularity.The center of a black hole would not really be a hole at all,but an infinitely dense point.Anything that crosses the black hole is pulled in by its great gravity.Although black holes do exist,they are difficult to observe.These are the reasons.No light or anything else comes out of black holes.As a result,they are invisible to a telescope.In astronomical terms,black holes are truly tiny.For example,a black hole formed by the collapse of a giant star would have an event horizon（视界）only 18 miles across.The nearest black holes would be dozens of light years away from Earth.One light year is about 6 trillion（万亿）miles. Even the most powerlul telescopes could not pick out an object so small at such a great distance.In 1994 the Hubble Space Telescope provided evidence that black holes exist.There are still answers to be found,however,so black holes remain one of the mysteries of the universe.The nearest black holes are hundreds of light years away from us.A:Right B:Wrong C:Not mentioned
考题
共用题干
Black HolesMost scientists agree that black holes exist but are nearly impossible to locate.A black hole in the universe is not a solid object,like a planet,but it is shaped like a sphere（球体）. Astronomers（天文学家）think that at the center of a black hole there is a single point in space with infinite（无限的）density（稠密）.This single point is called a singularity（奇点）. If the singularity theory is correct,it means that when a massive star collapses,all the material in it disappears into the singularity.The center of a black hole would not really be a hole at all,but an infinitely dense point.Anything that crosses the black hole is pulled in by its great gravity.Although black holes do exist,they are difficult to observe.These are the reasons.No light or anything else comes out of black holes.As a result,they are invisible to a telescope.In astronomical terms,black holes are truly tiny.For example,a black hole formed by the collapse of a giant star would have an event horizon（视界）only 18 miles across.The nearest black holes would be dozens of light years away from Earth.One light year is about 6 trillion（万亿）miles. Even the most powerlul telescopes could not pick out an object so small at such a great distance.In 1994 the Hubble Space Telescope provided evidence that black holes exist.There are still answers to be found,however,so black holes remain one of the mysteries of the universe.The sun is the heaviest star in the universe.A:Right B:Wrong C:Not mentioned
考题
单选题At sea，on what occasion would you display two red lights at night or two black balls during the day?（）.A
When vessel is on fireB
When vessel is not under commandC
When vessel is carrying the dangerous cargoesD
When vessel is restricted in her ability to maneuver
考题
单选题Which statement is TRUE concerning a towing vessel which，due to the nature of her work，is unable to keep out of the way of another vessel?（）A
By day，she shall carry a black cylinder shapeB
By day，she shall carry two black balls in a vertical lineC
By night，she would show the same lights as a vessel not under commandD
By day，she would show the same shapes as a vessel restricted in her ability to maneuver
考题
单选题A fishing vessel displaying the lights shown is（）.A
anchoredB
underway but not fishingC
tending a small fishing boatD
fishing by trawling
考题
单选题A power driven vessel when towing and the length of the tow exceeds 200 meters shall exhibit during daylight hours where they can best be seen which of the following shapes? （）A
a diamond shapeB
two cones，apexes togetherC
a black ballD
one cone，apex upward
考题
单选题A vessel trawling will display a（）.A
red light over a white lightB
green light over a white lightC
yellow light over a red lightD
white light over a green light
考题
单选题A vessel engaged in fishing during the day would show（）.A
one black ballB
two cones with bases togetherC
a cone，apex downwardD
two cones，apexes together
考题
单选题A vessel would be referred to as tender when the weight of the cargo is（）.A
evenly distributed vertically and the double bottoms are fullB
concentrated low and the double bottoms are emptyC
concentrated low and the double bottoms are fullD
concentrated high and the double bottoms are empty
考题
单选题A sailing vessel is overtaking a steam vessel in a fairway on International waters，so as to pass on the steam vessel’s port side． The sailing vessel is the（）.A
privileged vessel and would sound two short blastsB
burdened vessel and would sound two prolonged blasts followed by two short blastsC
burdened vessel and would sound no whistle signalD
privileged vessel and would sound no whistle signal
考题
单选题During the day，a vessel with a tow over 200 meters in length will show（）.A
a black ballB
a diamond shapeC
two cones，apexes togetherD
one cone，apex upward
考题
单选题Which vessel would display a cone，apex downward（）.A
A fishing vessel with outlying gearB
A vessel proceeding under sail and machineryC
A vessel engaged in diving operationsD
A vessel being towed
考题
单选题A vessel is fishing at anchor on the high seas. Which of the following day signals should she display if she has gear extending out over 150 meters horizontally from the vessel?（）.A
A black ball in the forepart of her vesselB
A black double frustum of a coneC
A basket where best seenD
A black cone point upwards
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