()is the most visible signal of distress from a lifeboat at sea in the daytime.
A. Smoke signal
B. Flash signal
C. Fire signal
D. Radio emergency transmissio
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计划钢液量5000kg,加锰铁前,钢液含锰0.25%,加锰铁后,计算含锰量可到0.50%,但实际分析含锰量为0.45%,求实际钢水量?
通行证遗失必须及时向所在单位报失。
A. 正确
B. 错误
料箱、料架、工装、物品定置定位线宽度标准为()
A. 30MM
B. 40MM
C. 50MM
D. 60MM