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【单选题】
起重机在试运转过程中，在( )不得进行下一步骤的试运转。A.
上一步骤未合格之前
B.
上一步骤没验收之前
C.
上一步骤合格后没验收之前
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【简答题】翻译: As cultural change depends, the number of marriage across nations is increasing .
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【简答题】根据输送血液的方向,动脉是 管道;静脉是 管道。(填离心或向心)
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