角是由一点引出的两条( )组成的图形。
射线
As we are _____ Table Cloth, we should be pleased if you would send us your best quotations.
A.in the market forB.on the market forC.entering the market for D.at the market for
我国安全生产管理方针是()
A.安全第一、预防为主、综合治理
B.以人为本,安全第一
C.安全生产,人人有责;