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单选题
827、Be careful when you move jet pipes or exhaust cones that have insulating blankets.
A
Jet pipes have insulating blankets Be careful when. you move exhaust cones.
B
Be careful when you move jet pipes or exhaust cones having insulating blankets.
C
Be careful when you move jet pipes, or exhaust cones have insulating blankets.
答案解析
正确答案：B
解析：
解析:注释:题干主干为“移动带有隔热层的喷气管或排气管时要小心”A 选项将有隔热层作为移动的前提,排除;C 选项将隔热层作为另一种形式,排除。
相关知识点：
垫片厚度计算为t=f x-y s
