A、h/250≤10.0 B、h/250≤15.0 C、h/500≤10.0 D、h/500≤15.0
A.h/500 B.h/1000 C.h/1500 D.h/2000
A.l/1000,且不應(yīng)大于10.0 B.l/1000,且不應(yīng)大于15.0 C.l/1500,且不應(yīng)大于10.0 D.l/1500,且不應(yīng)大于15.0