After you enter Thimble Shoal Channel,you will alter course to pass between Trestle “A” and “B”. Which channel should you use?()
A. Thimble Shoal Main Channel or the South Auxiliary Channel
B. Any of the channels but keep to the right hand side
C. The South Auxiliary Channel
D. Thimble Shoal Main Channel
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矿产储量是指经地质勘查工作证实存在的()的矿量。
A. 矿床
B. 矿体
C. 矿物
D. 矿石
通常笔记本硬盘尺寸为()
A. 2.5英寸
B. 3.5英寸
C. 500G
D. 1T
消除电渣压力焊的钢筋弯折的措施有()。
A. 钢筋端部安放正直
B. 注意安装和扶持上不钢筋
C. 避免焊后过快卸掉夹具
D. 减小焊接电流