完成下列单位换算：5×102μA=____mA=____ A；0.03A=_____ mA=____ μA。
0.5；5×10-4 ；30；30000
— David, you clean the blackboard today, ____ ?
— With pleasure. I cleaned it yesterday, though.
A. will you
B. do you
C. don't you
D. didn't you
监理工程师在何种情况下才受理工程延期？
