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单选题
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, in order to protect human lives and to achieve safe and correcct operation of systems, it is obligatory to properly understand maintenance and operation documentation.
B
In aviation，it is required by rule that correct understanding of maintenance and operation documentation should be determined by safe and correct operation of systems and human lives.
C
In aviation, you have to properly understand maintenance and operation documentation so that the safe and correct operation of systems can protect human lives.
答案解析
正确答案：C
