经旋风分离器回收的颗粒重量与进入系统的颗粒总重量之比称为（）。
A. 分级效率
B. 组成效率
C. 总效率
D. 效率
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径向分度盘修锉经铣削加工后的分度槽的精度主要取决于辅助样板的精度。
A. 正确
B. 错误
从刚刚切断的南瓜茎基部的伤口处，可以看到流出的汁液，这种现象叫吐水。
A. 正确
B. 错误
A note of protest is a declaration made by the Master of a vessel before a notary public.Its purpose is to（）.
A. Protest acts of violence or misconduct by the vessel's crew
B. State that damage to cargo or vessel was caused by improper loading or pilferage by others rather than ship's personnel
C. State that the damage to ship，cargo or both was due to the perils of the sea
D. State that the perishable cargo was damaged because of negligence by port authorities or other official
（）主要指由于汇率变化而引起资产负债表中某些外汇项目金额变动的风险。
A. 交易风险
B. 经营风险
C. 经济风险
D. 会计风险
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