A.100um B.120um C.125um D.150um
A.H/1000,且不應(yīng)大于25.0mm B.H/800,且不應(yīng)大于30.0mm C.H/600,且不應(yīng)大于40.0mm D.H/400,且不應(yīng)大于60.0mm
A.12h B.24h C.36h D.48h