不是造成润滑系统机油压力过低原因的是()。
A.机油泵磨损
B.主轴承、连杆轴承、凸轮轴衬套等配合间隙过大
C.机油牌号正确
D.机油温度过高使粘度降低
参考答案:C
We need ____ refrigerator, so we are going to buy ____ from the department store this afternoon.
A.a; it
B.the; one
C.a; one
D.the; the one
外感风寒多见( )
A.咳声重浊B.咳声清脆C.咳声顿作D.咳声如犬吠E.咳声不扬