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单选题
在开启舱门前，请确保客舱压差为零。
A
Make sure that the cabin differential pressure is zero before you unlock the door.
B
Be sure that the variance of the cabin pressure is zero before you open the door.
C
Make certain that the difference of the compartment compression is zero before you open the door.
答案解析
正确答案：A
相关知识点：
开舱门前确保客舱压差为零
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