体重50kg的成人每小时正常基础需要量约为()
A．30ml
B．60ml
C．90ml
D．120ml
E．150ml
参考答案：C
The boys _______themselves last night, did they?
A enjoyed B didn’t enjoy C haven’t enjoyed D have enjoyed
能使汽油胶质上升的原因有（）
A.顶回流换热器内漏
B.轻柴油换热器内漏
C.一中发汽换热器内漏
