题目内容

手选皮带一般采用（）

A. 平行托辊
B. 缓冲托辊
C. 下托辊
D. 以上答案都对

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解释新月形沙丘的发育演化。

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