题目内容

刚性转子的动平衡必须选两个平衡平面。

A. 对
B. 错

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unsure (Para. 1, Line 4): ______

A. doubtful
B. clear
C. knowledgeable

acquaintance (Para. 2, Line 2): ______

A. stranger
B. a person whom one knows but do not know well
C. expert in one field

significance (Para. 2, Line 4): ______

A. basic knowledge
B. importance
C. evaluation

outrank (Para. 3, Line 11) : ______

A. to be more important than
B. to have a lower rank than
C. to be out of a list