以下关于架空乘人装置焊接件焊缝质量的描述，正确的是（）
A. 不应有裂纹
B. 不应有夹渣
C. 不应有间断
D. 不应有烧穿
E. 不应有结疤
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Sidewise force of the propeller tends to throw a vessel’s stern to the right or left，depending on rotation. This force is caused by（）.
A. back current from the rudder
B. greater pressure on the right or left side of the propeller，depending on rotation
C. lower pressure on the right or left side of the propeller，depending on rotation
D. torque from the velocity and angle at which the surrounding water impinges upon the propeller blade
保兑仓模式中购货商所代理销售的商品收入占其全部销售收入的（）以上，具有一定的销售该商品的能力和渠道
A. 40%
B. 50%
C. 60%
D. 70%
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