题目内容

防雷保护接地装置指的是埋入地内( )m以下的接地极组,是导雷入地的散流极。

A. -0.5
B. -0.7
C. -1.0
D. -1.3

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闪光对焊时焊件(棒材或厚壁管材)的伸出长度一般为直径的______倍。

A. 0.5
B. 0.7~1
C. 1.5
D. 2

Anyone who doubts that global financial markets control national economies need only look at the crisis facing the "tigers" of the Far East.()

A. local
B. universal
C. European
D. Asian

地基内一点的应力状态为σz=125kPa,σx=60kPa,τzx=τxz=25kPa,地基土为无黏性土,φ=30°。则该点处于()状态。

A. 极限平衡状态
B. 弹性平衡状态
C. 破坏状态
D. 无法确定

To succeed in a scientific research project, ().

A. persistence is what one needs
B. persistence is needed
C. one needs be persistent
D. one needs to be persistent

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