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【单选题】
在拆装发动机和汽车的过程中,以下做法哪个是正确的( )A.
应趁热放油
B.
对于多螺栓的紧固件，在拆卸过程中，应按从中央到四周的顺序
C.
40°以上拆散发动机
D.
在拆卸各种液体管道时，各种管接头直接裸漏于大气
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【简答题】中心静脉压的正常值为（）cmH 2 O。
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