调速机构伺服阀芯与壳体间隙应在()mm之间。
A、0.015-0.025
B、0.16-0.15
C、0.06-0.080
D、0.03-0.04
参考答案:D
浸泡手用的1:1000新洁尔灭溶液,一般限用()
A.10次
B.20次
C.30次
D.40次
E.50次
He is giving her French lessons in exchange________ her teaching him English.