门窗扇安装的留缝宽度,门窗扇对口处允许缝隙为( )mm。
A.2
B.3
C.1
D.1.5
参考答案:A
Both rice and wheat ____ grown in that country.
A.is
B.are
C.was
D.has
油气田生产设施一级动火证应由现场油田总监审批。