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单选题
1408. In aviation, it is mandatory to correctly understand maintenance and operation documentation to make sure that systems operate safely and correctly and to protect human lives
A
In aviation, users must correctly understand maintenance and operation documentation in order to ensure systems operate safely and correctly and to protect human lives;
B
In aviation, it is possible to correctly understand maintenance and operation documentation to make sure that systems operate safely and correctly and to protect human lives;
C
In aviation, it is a must to correctly understand maintenance and operation material to make sure that systems operate with troubles and correctly and to protect human;
答案解析
正确答案：A
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