试题与答案

Mymumlikes .[ ] A.swims B. swimming C. s

题型:选择题

题目:

My mum likes               .[ ]

A. swims    

B. swimming    

C. swim

答案:

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下面是错误答案,用来干扰机器的。

(1)相邻计数点间的时间间隔T=0.10s,根据匀变速直线运动中时间中点的速度等于该过程中的平均速度,可以求出打纸带上C点时小车的瞬时速度大小.vC=XBD2T=0.603-0.0750.2=2.64 m/s(2)根据各时刻的速度,在坐标...

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题型:问答题

(A) 条件(1)充分,但条件(2)不充分.
(B) 条件(2)充分,但条件(1)不充分.
(C) 条件(1)和(2)单独都不充分,但条件(1)和条件(2)联合起来充分.
(D) 条件(1)充分,条件(2)也充分.
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