My father ____________ every day. [ ]
A. go to work by bus
B. goes to work by bus
答案:B
某溶液中含有Cl-、SO42-、Fe3+、K+、M,且离子物质的量之比为2∶3∶1∶3∶2,则微粒M可能为 ( )
A.Na+
B.Ag+
C.Ba2+
D.Mg2+
直接制版法晒完版后应()
A.立即冲版
B.应再曝光补强
C.先浸泡水中
D.禁止浸泡于水中