网友您好， 请在下方输入框内输入要搜索的题目：
题目内容
（请给出正确答案）
单选题
Factories must clean their water _____.
A
before they are thrown away
B
when they are thrown away
C
after it is thrown away
D
before it is thrown away
参考答案
参考解析
解析：
由第三段第二句“Factories must now clean their water before it is thrown away…”可知。
由第三段第二句“Factories must now clean their water before it is thrown away…”可知。
更多 “单选题Factories must clean their water _____.A before they are thrown awayB when they are thrown awayC after it is thrown awayD before it is thrown away” 相关考题
考题
As mentioned,‘grey water’ can be used to＿，A．wash the carB．water the gardenC．clean the toiletD．dispose of wastes
考题
29． The writer thinks that people in large cities should __________ ．A． stop the used water from getting into undergroundB． only use the water from the riversC． make their used water clean againD． use as much sea water as possible
考题
In Leon Nacson’s view, air and water are our Number One priorities for the following reasons except ().A、he cannot understand why people are polluting air and waterB、there will definitely be no fresh air and clean water for future generationsC、we would run out of air and water if we didn’t stop polluting themD、air and water polluting are the current and futu
考题
___ the clean water in this area is being used up.
A.It is decidedB.It is reportedC.It is demanded thatD.It is happened that
考题
The medicine________ cool, clean and dry.
A.must keepB.must be keptC.must be keepD.must be in
考题
If the jacket water temperature rises rapidly above normal in a diesel engine, you should firstA.place standby cooler in operationB.reduce engine loadC.check thermostatic valveD.clean sea water strainer
考题
As mentioned，“grey water”can be used to______.A．wash the carB．water the gardenC．clean the toiletD．dispose of wastes
考题
When started, a complete oily water separating unit is first filled ______. The oily water mixture is then pumped through the inlet pipe into the coarse separating compartment.A.with dirty waterB.with clean waterC.by oily waterD.by mixed water
考题
Dirty oil must be ______before being used again .A.mixed with clean oilB.purifiedC.heatedD.strained
考题
Prior to getting underway in fresh or brackish water，the Master must ______.A.log the density of the waterB.secure all overboard dischargesC.take on fresh water ballastD.clean the sides with fresh water
考题
All the holds to be loaded with grain must be swept ______ commencement of loading．A.Cleanly/duringB.Clear/meanwhileC.Clean/betweenD.Clean/prior to
考题
Some canals,such as the Suez of the Panama,save ships weeks of time by making their voyage a thousand miles shorter.Other canals permit boats to reach cities that are not（ ）on the coast,still other canals drain lands where is too much water,help to irrigate fields where there is not enough water,and furnish water power for factories and mills.A.lain
B.stationed
C.set
D.located
考题
共用题干
WaterEarth is like a big blue marble.From high above the Earth and from the moon,the planet gleams and shines.The blue water in the oceans and seas of the Earth makes a dramatic image.The white clouds above the Earth add beauty to the picture.Water is the source of this beauty and the source of life on Earth.It is the reason people can live on this planet. Water is everywhere.(46)_______.It is in the soil,the ground that grows the food.Water is in rock deep under the ground, in natural holding areas一in storage.In a real sense,water keeps Earth alive.Nature has an unchanging amount of water. Nature has a perfect system for recycling water. (47)_____.It falls as rain.Then it goes to one of three places.It might sink slowly through the soil into the natural holding areas in the rock.(48)_______一by becoming vapor,or gas.It might run off into streams,rivers and oceans.By itself,nature can keep the balance and provide plenty of clean water for us.Nature recycles water.However,people cause problems for this natural recycling system.Nature's recycling system can work well(49)________.Some ways that people upset nature are easy to understand.For example, dirty sewage（污水沟系统）water from homes and factories must not mix with drinking water. People get sick from drinking contaminated water. Sometimes water from factories goes into streams and rivers.It enters into the groundwater. It can flow into lakes too.This kind of contamination from industry(waste water from factories) can be dangerous for people.If water contains poisons and chemicals,it is poison.(50)________;some poisons kill people as well as birds and animals.Without knowing,people can upset nature's recycling system.Lakes and rivers add beauty to the world. People enjoy water for entertainment purposes,too. People enjoy swimming and playing in the cool water of a lake in the summer. They like to ride on boats on rivers.Many people enjoy catching fish in the rivers.They fish for food and for sport.However,in some places,the water of the lakes and rivers is no longer safe.These rivers and lakes are contaminated.The fish are dying because of the chemicals from farms and factories.People cannot swim in the polluted water._________（49）A:Poison makes people sickB:It is in the air that people breatheC:We can not live without waterD:Water is used again and againE:only if people work with the system and not against it F: It might disappear into the air quickly
考题
单选题According to the instructions, which of the following is TRUE?A
The gasket should be cleaned thoroughly with cold water.B
Mild detergent and hot water can best clean the cooker.C
Soapy water will often damage the cooker.D
Sand can be used to clean the cooker.
考题
单选题Permission is requested to pump out about 200 tons of clean sea ballast water for （） purposes．A
safe manningB
trimmingC
avoiding collisionD
preventing pollution
考题
单选题Which of the following is wrong about operation of oily water separator?（）A
filled with clean water before operationB
keep air cushion in oil collecting space during runningC
check oil level during runningD
clean inner separator with low pressure stream
考题
单选题When oily water separator is operating, which measure （） is wrong.A
pay attention to operating parametersB
renew and clean separating units in timeC
check oil level in separator to prevent overloadD
check separating effect, if it is bad, flush with large capacity water pump
考题
单选题In a diesel engine jacket water cooler, with seawater cooling the fresh water, the（）A
sea water temperature must never be warmer than 40℃B
jacket water pressure should always be greater than the sea water pressureC
jacket water temperature must always be less than 60℃D
jacket water pressure must always be less than the sea water pressure
考题
单选题Before the oily water separator put into operation, it should be （）A
filled with bilge waterB
filled with oilC
filled with clean waterD
be emptied
考题
单选题When（）clean ballast water from any vessel，an application shall be made to Harbor Authorities for approval.A
dischargingB
recirclingC
loadingD
taking in
考题
单选题Dirty oil must be （） before being used again.A
mixed with clean oilB
purifiedC
heatedD
strained
考题
单选题Clean oil is achieved in a clarifier bowl where the impurities and water collect at the bowl （）.A
bottomB
topC
centerD
periphery
考题
单选题When started, a complete oily water separating unit is first filled （）The oily water mixture is then pumped through the inlet pipe into the coarse separating compartment.A
with dirty waterB
with clean waterC
by oily waterD
by mixed water
考题
单选题To thoroughly pump out the bilges using a horizontally mounted centrifugal pump, the （）.A
pump must always be primedB
volute must impart a radial and rotary motion of the water suction sideC
connection must guide the liquid to the lantern ringsD
stuffing box should not be allowed any water leakage
考题
问答题Practice 5 Water is essential for life. Yet many millions of people around the world face water shortages. Many millions of children die every year from water-borne diseases. And drought regularly afflicts some of the world’s poorest countries. The world needs to respond much better. We need to increase water efficiency, especially in agriculture. We need to free women and girls from the daily chore of hauling water. We must involve leaders of countries in decision-making on water management. We need to make sanitation a priority. This is where progress is lagging most. And we must show that water resources need not be a source of conflict. Instead, they can be a catalyst for cooperation. Significant gains have been made. But a major effort is still required. Our goal is to meet the internationally agreed targets for water and sanitation by 2015, and to build the foundation for further progress in the years beyond. This is an urgent matter of human development, and human dignity. Together, we can provide safe, clean water to the entire world’s people. The world’s water resources are our lifeline for survival, and [or sustainable development in the 21st century. Together, we must manage them better.
考题
单选题Prior to getting underway in fresh or brackish water，the Master must（）.A
log the density of the waterB
secure all overboard dischargesC
take on fresh water ballastD
clean the sides with fresh water
热门标签
最新试卷
