×
单选题
The Handbook should advise pilots to obtain a service manual prior to performing preventive maintenance to be sure that proper procedures are followed.
A
The Handbook should advise pilots to
obtain a service manual before performing
preventive maintenance to be sure that proper
procedures are observed.
B
The Handbook should advise pilots to
obtain a service manual after performing
preventive maintenance to be sure that proper
procedures are followed.
C
The Handbook should advise pilots to
obtain a service manual prior to perform preventive maintenance to be sure of the following procedures.
答案解析
正确答案：A
