Before opening and closing the hatches, the spaces around the covers, all the parts and the gears should be （）.<br>A:cleared<br>B:checked<br>C:removed<br>D:repaired

Before opening and closing the hatches, the spaces around the covers, all the parts and the gears should be （）.
A:cleared
B:checked
C:removed
D:repaired

出自：船舶水手证

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