当凹版版辊表面出现轻微划伤时，可以使用（）进行消除。
A. 400#砂纸打磨
B. 退铬重镀
C. 专用砂网打磨
D. 重新制版
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什么是汽车的整备质量？汽车的总质量？汽车的装载质量？比功率？轴荷分配？
阿拉伯数学家（）的《还原与对消计算概要》通常被称作《们尔热巴拉和阿尔穆卡巴拉》。
社会体育指导员行为举止要有礼貌、大方、谈吐用词文明得体，仪表仪容整洁保持良好形象。
A. 正确
B. 错误
You are on a container vessel. What concerning the handling and stowage of containerized hazardous materials is TRUE?（）.
A. Open-bed containers may be used to transport hazardous materials if the cargo is properly secured
B. A portable cargo tank of a flammable，cryogenic liquid may not be in transit for a period exceeding its marked rated holding time unless the liquid is inhibited
C. A portable cargo tank containing a cryogenic liquid must be shipped on deck unless forced ventilation is provided to the tween-decks
D. A container loaded with packages of tear gas would display a placard reading Irritant
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