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单选题
The aircraft and engine manufacturers recommend that you do not weld engine components when the engine is installed on the airframe.
A
You had better not to weld engine components when the engine is installed on the airframe.
B
You＇re not allowed to operate engine components when the engine is installed on the airframe.
C
You had better not to weld engine components when the engine is running.
答案解析
正确答案：A
