我们每航次拆卸一次吊杆。（）A、We dismantle the jumbo boom twice a voyage.B、We dismantle the derricks once a voyage.C、We examine the derricks once a voyage.D、We dismantle the heavy derricks once a voyage.
我们每航次拆卸一次吊杆。（）
- A、We dismantle the jumbo boom twice a voyage.
- B、We dismantle the derricks once a voyage.
- C、We examine the derricks once a voyage.
- D、We dismantle the heavy derricks once a voyage.
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