单项选择题
A.进油管和油泵B.进油管和加热器C.油泵和加热器D.加热器和出油管
A.0.69~0.84B.1.70~1.93C.2.92~3.43D.3.86~4.09
A.先锁紧上侧2颗,再锁紧下侧2颗B.先锁紧孔侧2颗,再锁紧槽侧2颗C.先锁紧槽侧2颗,再锁紧孔侧2颗D.对角锁紧
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