装卸货之前，打开舱盖。（）
- A、After loading and discharging, hatch covers will be opened.
- B、After loading and discharging, hatch covers will be closed.
- C、Before loading and discharging, hatch covers will be opened.
- D、Before loading and discharging, hatch covers will be closed.
正确答案:C
答案解析:有
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