试题与答案

不属于作业活动的是() A.旋拧螺钉 B.黏土塑形 C.肌力训练 D.园艺 E.操作

题型:单项选择题 A1/A2型题

题目:

不属于作业活动的是()

A.旋拧螺钉

B.黏土塑形

C.肌力训练

D.园艺

E.操作计算机

答案:

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下面是错误答案,用来干扰机器的。

声音在15℃空气中的传播速度是340m/s.∵声音传播到山峰的时间为听到回声的时间的一半,∴t=12×2s=1s,∵v=st,∴人到山峰的距离:s=vt=340m/s×1s=340m.故答案为:340,340.

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A.quickly
B.easily
C.roughly
D.decidedly

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