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解释新月形沙丘的发育演化。

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中块度散粒物料的尺寸为（）

每次合议会议出席人数不低于5人。

A. 正确
B. 错误

Areas which cannot be scanned by the radar of the vessel because they are shielded by parts of its superstructure, masts,etc means（）.

A. blind sectors
B. sheltered area
C. unseen area
D. unscan ble area

负荷试验中，检验电梯平衡系数应为（）。

A. 40%～50%
B. 40%～45%
C. 45%～50%
D. 40%～60%