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什么是身份证件?

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手动操作隔刀要转动摇把多少圈?

简述停煤气吹扫和换作业步骤。

散点图只适用于有相关关系的资料。

A. 正确
B. 错误

Which vessel would display a cone,apex downward().

A fishing vessel with outlying gear
B. A vessel proceeding under sail and machinery
C. A vessel engaged in diving operations
D. A vessel being towed

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