问答题

造成对掘进机送不上电或电动机停止运转的一般原因有、或。

答案：单相接地

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One of the patients could not categorize the expression on faces that she was shown in photographs in terms ___ whether the expression was one of happiness, anger, surprise and so on.

答案： of

不定项选择

硅酸盐熔体的表面张力随温度升高而增大。

A．正确
B．错误