A. 正确 B. 错误
A. 船检局 B. 海事局 C. 船级社 D. 技术监督局
A. 船长或轮机长 B. 大副 C. 大管轮 D. 高级轮机员
A. 5？ B. 10？ C. 15 D. 20
A. the amount of oxygen in a space B. the presence of harmful amounts of carbon monoxide C. concentration of explosive gas
An electric motor B. An alternator C. A fresh water generator
A. a reduction B. an increase C. a downwards
A. Chief Engineer B. motorman C. electrician
A. hacksaw B. screwdriver C. flashlight
A. use B. trouble C. cause
微信支付 
支付宝支付