题目内容

人能察觉出同类刺激物之间的极微小差别的能力被称为差别阈限。()

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积极防御要坚持自卫的后发制人的原则。()

装设接地线时应()。

A. 先装中相后装两边相
B. 先装两边相后装中相
C. 先装导体端
D. 先装接地端

对于相同厚度的下列物质,那种对1Mev能量的γ射线屏蔽效果好()
A水
B水泥
C铁
D铅

In the stowage of deck cargo,cribbing is ______.

A. Placed on deck to support the cargo
B. Separation pieces used to keep cylinders upright and steady
C. Shims for stowing baled cargo
D. Nets placed across the hatch opening to keep the cargo from falling in the hatch

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