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.

BYou‘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.

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正确答案：A （备注：此答案有误）

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