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【单选题】
质量为m的子弹以速度 v 0 水平射入沙土中,设子弹所受阻力与速度相反,大小与速度成正比,比例系数为k,忽略子弹的重力,子弹进入沙土的最大深度为A.
mv 0 /k
B.
km/v 0
C.
kv 0 /m
D.
kmv 0
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举一反三
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A.
uncertainty avoidance
B.
norms
C.
power distance
D.
collective
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A.
18
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【单选题】By mentioning the high price of cast members shoes, the author intends to______.
A.
prove the formality of management of Scottish Opera
B.
compliment the skill of the shoes designer
C.
provide another possible reason of Scottish Opera's bad financial status
D.
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A.
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B.
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C.
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D.
18
【单选题】----Look! ________a high probability that their team will win. ----Yes, the members are cooperating so well.
A.
It is
B.
It was
C.
There was
D.
There is
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