When referring to dry bulk cargoes，the term “flow state”（）.
A. designates the state of a commodity when the ship is heeled past the angle of repose
B. relates to the suitability of loading a cargo by flowing down inclined chutes
C. refers to the saturation of a dry bulk product with water to the point where it acts as a liquid
D. relates to the minimum granule size of a particular product where it will flow like a liquid at an angle of 30°
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根据图纸上设计内容将特征点在实地进行标定的工作称为（）。
A. 直线定向
B. 联系测量
C. 测图
D. 测设
公共政策学概念体系中的边际概念是从其他学科引申过来的概念｡
A. 正确
B. 错误
使用有链牵引采煤机时，在开机前必须先（），防止牵引链跳动伤人。
A. 发出信号
B. 喷水
C. 敲打
D. 躲开
E. 喊话
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