题目内容

力学性能指标中符号σb表示______。

A. 屈服点
B. 抗拉强度
C. 伸长率
D. 冲击韧度

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The instructions on how to use the new machine （）that nobody seemed to be able to understand.

A. were very simplistic
B. was very confused
C. were so confusing
D. was so simplistic

His presidential address in New York （）on the importance of communication between science and industry.

A. bore
B. spoke
C. dwelt
D. threw

镍的化学元素符号是______。

A. Na
B. Ne
C. Ni
D. Nb

This special committee was established for well-integrated members of the society and not for （）individuals.

A. marginal
B. minor
C. eccentric
D. distinctive