A.Ⅰ級(jí)片 B.Ⅱ級(jí)片 C.Ⅲ級(jí)片 D.無(wú)要求
A.渦輪流量計(jì) B.渦街流量計(jì) C.轉(zhuǎn)子流量計(jì) D.超聲波流量計(jì)
A.(0.2,0.4] B.(0.4,0.8] C.(0.8,1.6] D.(1.6,2.5]