If your asphalt barge has operated more than 12 months in saltwater in the 24 month period since it was last dry-docked,when is it required to be hauled out again? ()
A. 12 months since last dry-docking
B. 18 months since last dry-docking
C. 24 months since last dry-docking
D. 36 months since last dry-docking
查看答案
进行有毒物质试验时,要在()内操作并保持室内有良好的通风。
A. 密封容器
B. 通风橱
C. 有排风机的实验室
D. 普通实验室
三相桥式整流电路由()个整流二极管和1个三相整流变压器组成。
A. 2
B. 4
C. 6
D. 8
共产党员要节俭办丧事,一般不成立治丧机构,只举行向遗体告别仪式,不开追悼会。
A. 正确
B. 错误