A.絕對(duì)粘度; B.運(yùn)動(dòng)粘度; C.相對(duì)粘度.
A.1∶4 B.1∶3 C.1∶5
A.斜鍵長(zhǎng)度的70% B.輪轂長(zhǎng)度的70% C.鍵長(zhǎng)的90%