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何谓 Dark field?
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My little brother used to be afraid of the dark．（改为反意疑问句）My little brother used to be afraid of the dark，_____ _____?
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Blood flowing from a cut artery appears ______.A.dark red with a steady flowB.bright red with a steady flowC.bright red and in spurtsD.dark red and in spurts
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Dark Forces Dominate UniverseThe earth,moon,sun and all visible stars in the sky make up less than one percent of the universe.Almost all the rest is dark matter and dark energy,unknown forces that _______(1)astronomers.Observations in recent years have changed the basic_______(2)of how the universe evolved and have indicated how little is known about the major forces and substances that_______(3)our world.Astronomers now know that luminous（发光的）matter一stars , planets and hot gas一 accounts_______(4)only about 0.4 percent of the universe.Non-luminous components , such as black holes and intergalactic（星系间的）gas,_______(5) up 3.6 percent.The rest is either dark matter,about 23 percent,or dark energy,about 73 percent.Dark matter,sometimes_______(6)"cold dark matter,"has been known for some time.Only recently have researchers come to understand the key role it_______ (7)in the formation of stars,planets and even people."We_______(8)our very existence to dark matter,"said physicist PaulSteinhardt and a co-author of a review on dark matter which_______(9)not long ago in the journal Science."Dark matter dominated the structure_______(10)in the early universe," Steinhardt said."For the first few billion years dark matter contained most of the mass of the universe. You can think of ordinary matter_______(11)a froth（泡沫）of an ocean of dark matter. The dark matter clumps（结成块）and the ordinary matter falls into it. That_______(12) to the formation of the stars and galaxies（星系）."Without dark matter,"there would be virtually no structures in the universe,"The nature of dark matter is_______(13).It cannot be seen or detected directly. Astronomers know it is there because of its_______(14) on celestial（天体的）objects that can be seen and measured.But the most dominating force of all in the universe is called dark energy,a recently ________(15)power that astronomers say is causing the galaxies in the universe to separate at a faster and faster speed._________(11) A:with B:as C:from D:beside
考题
Which of the following statements is NOT true?（）AThe open field system provided a good opportunity to experiment.BThe open field system wasted land.CThe open field system was wasteful of labor and time.DThe open field system made livestock farming difficult.
考题
Which of the following statements is NOT true?（）A、The open field system provided a good opportunity to experiment.B、The open field system wasted land.C、The open field system was wasteful of labor and time.D、The open field system made livestock farming difficult.
考题
Yuri created a formula for a button. The code is supposed to set the value of an existing field called title. He used the following formula: title:= @propercase (title); after the foumula runs ,the title field is null. Why? （）A、the value of one field cannot be set from the value in another field B、the text string in the formula is set to null. Thus notes cannot validate the formula C、when setting the value of a field , the formula must be in the field‟s input validation event D、the formula does not specify that title is an existing field. Thus it is interpreted as a temporary variable
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Which of the following is true about the MPLS header and its EXP field size？（）A、The MPLS header is 2 bytes，and the EXP field is 3 bits long.B、The MPLS header is 1 byte，and the EXP field is 3 bits long.C、The MPLS header is 4 bytes，and the EXP field is 3 bits long.D、The MPLS header is 3 bytes，and the EXP field is 3 bits long.
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jim has created a field hint for the address field. Users tell him this text disappears when they click in the address field. which one of the following is most likely reason?（）A、 the address field is computed B、 jim should have used a text popup C、 jim stored the field hint in the database D、 field hint only display when the user has not clicked in the field （field hint）
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You are developing a Windows Forms application that contains a DataGridView control. The DataGridView capture the customer's name, address, and phone number. You have been asked to provide data validation in a DataGridView to prevent users from leaving the.. You need to ensure that users cannot tab out of the name field without entering data What should you do ?（）A、Validate the name field in the CellValidating event. Set e.Cancel = true if the name field isB、Validate the name field in the CellErrorTextChanged event. Get e.RowIndex if the name field ..C、Validate the name field in the CellEnter event. Set the focus on the name field if the name ...D、Validate the name field in the CancelRowEdit event. Set the focus on the name field if the name ...
考题
单选题Which of the following statements is NOT true?（）A
The open field system provided a good opportunity to experiment.B
The open field system wasted land.C
The open field system was wasteful of labor and time.D
The open field system made livestock farming difficult.
考题
单选题They had the appearance of dark-skinned and dark-haired humans, _______ of course they were much smaller than ordinary people.A
howeverB
although C
while D
nevertheless
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单选题jim has created a field hint for the address field. Users tell him this text disappears when they click in the address field. which one of the following is most likely reason?（）A
the address field is computed B
jim should have used a text popup C
jim stored the field hint in the database D
field hint only display when the user has not clicked in the field （field hint）
考题
单选题I don't feel like going out now: I'm not used to have a walk after dark.A
don'tB
going outC
to have a walkD
after dark
考题
单选题Adam Smith was a professor of philosophy, a commissioner of customs, and founded the field of modern economics.A
a commissioner of customs, and founded the field of modem economicsB
worked as commissioner of customs, and founded the field of modern economicsC
a commissioner of customs, and the founder of the field of modern economicsD
commissioned customs, and was the founder of the field of modern economicsE
a commissioner of customs, and was the founder of the field of modem economics
考题
单选题Yuri created a formula for a button. The code is supposed to set the value of an existing field called title. He used the following formula: title:= @propercase (title); after the foumula runs ,the title field is null. Why? （）A
the value of one field cannot be set from the value in another field B
the text string in the formula is set to null. Thus notes cannot validate the formula C
when setting the value of a field , the formula must be in the field‟s input validation event D
the formula does not specify that title is an existing field. Thus it is interpreted as a temporary variable
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单选题To provide quality of service （QoS） for voice traffic in an IEEE 802.1 q network， which class of service （CoS） value should be used in the 3-bit， user priority bits （PRI） field？ （）A
The PRI field should contain the Cos value of 010B
The PRI field should contain the Cos value of 011C
The PRI field should contain the Cos value of 100D
The PRI field should contain the Cos value of 101E
The PRI field should contain the Cos value of 110F
The PRI field should contain the CoS value of 111
考题
单选题Which of the following is true about the MPLS header and its EXP field size？（）A
The MPLS header is 2 bytes，and the EXP field is 3 bits long.B
The MPLS header is 1 byte，and the EXP field is 3 bits long.C
The MPLS header is 4 bytes，and the EXP field is 3 bits long.D
The MPLS header is 3 bytes，and the EXP field is 3 bits long.
考题
单选题Hardly did he hear his mother's calling when he realized that it was already dark.A
did he hearB
callingC
whenD
it was already dark
考题
单选题_____ he realized it was too late to return home.A
No sooner it grew dark whenB
It was not until dark thatC
Scarcely it grew dark thanD
While it grew dark that
考题
单选题The most common type of AC service generator found aboard ship is the stationary （）.A
electromagnetic field, revolving armature typeB
electromagnetic field, oscillatory armature typeC
armature, oscillatory electromagnet field typeD
armature, rotating electromagnetic field type
考题
单选题They had the appearance of dark-skinned and dark-haired humans, _____ of course they were much smaller than ordinary people.A
howeverB
althoughC
whileD
nevertheless
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