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【单选题】
某物体的运动规律为dv/dt=-kv2t，其中k为常数。当t=0时，初速为v0，则速度v与时间t的函数关系是A.
v=v 0 +kt 2 /2
B.
v=v 0 -kt 2 /2
C.
1/v=1/v 0+ kt 2 /2
D.
1/v=1/v 0 -kt 2 /2
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【单选题】They ________ play football last Friday because Simon forgot to bring his football here.
A.
could
B.
couldn't
C.
would
D.
can
【单选题】They _______ play football last Friday because Simon forgot to bring his football here. [ ]
A.
could
B.
couldn't
C.
can't
D.
can
【单选题】They ________ play football last Friday because Simon forgot to bring his football here. A. could B. couldn’t C. can’t D. can
A.
1
B.
2
C.
3
D.
4
【简答题】Simon forgot __________ (4个词)(何时与朋友见面).
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