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【简答题】
电压和电位差的单位都是伏特，用字母V表示。（）
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皮皮学刷刷变学霸
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【单选题】Why did David come out to the battle?
A.
To kill Goliath
B.
To watch the action
C.
To bring provisions
D.
For fun
【判断题】Students should come out of the Internet cafe and come back to the real life.
A.
正确
B.
错误
【简答题】When spring comes and the flowers begin to bloom(开花), the bees come out of the hives(蜂房) very early in the morning. 小题1: The bee has a long tongue which goes into the flower to (吸) up the juice. 小...
【单选题】Bob can't come out to play because he help Dad in the garden. [ ]
A.
can
B.
can't
C.
has to
D.
must
【简答题】两球M 1 和M 2 的质量分别为m 1 和m 2 ，开始时M 2 不动，M 1 以速度v 1 撞于M 2 。设恢复因数k＝1，问在m 1 ≤m 2 、m 1 ＝m 2 、和m 1 ≥m 2 三种情况下，两球碰撞后将如何运动?
【单选题】One of the most interesting things to come out of the environmental issues meeting was the fact that we certainly do not have a ______of energy sources therefore, we must what we do have.
A.
plethora... husband
B.
microcosm... mitigate
C.
dearth... libel
D.
gamut... obfuscate
【简答题】二级火箭中各级的质量分别为m 1 和m 2 ，各级中包括的燃料质量分别为εm 1 及εm 2 。载荷的质量为m p 。如果火箭的总质量m 1 ＋m 2 为给定值，且燃料喷射的相对速度v r ＝常数。试证明要使火箭在燃烧完时的速度为最大，则，m 1 ，m 2 应满足下面的条件： m 2 2 ＋m p m 2 =m p m 1 并问当 时，火箭在燃烧完的速度为最大值时的质量比m 1 /m 2 ＝?
【单选题】Dole may no longer have to blow away the competition to triumph in the ____ expectations games. Now the party elders hope, all he needs to do to come out ahead is to come out ahead.
A.
devilish
B.
feverish
C.
gratifying
D.
promising
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