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船舶水手考试

睦霖题库>水路交通运输技能考试>船舶水手考试

The ()(双杆联吊) is that two booms are used with a single hook.

  • A、derrick
  • B、union purchase
  • C、topping lift block
  • D、crane
正确答案:B
答案解析:
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