细菌性 * * * * pH值为（）
A.3.8～4.4
B.5.0～6.5
C.4.0～4.7
D.5.0～5.5
E.6.5～7.0
参考答案：D
We have made（）that we would accept D/P terms for your present order.
A.clear
B.it is clear
C.that clear
D.it clear
威特单体泵系统开空调后发动机转速一般升高至（）rpm。
A.620
B.630
C.720
D.850
