电网事故过程中,各单位应首先接听上级调度的电话。非事故单位应加强设备监视,简明扼要的汇报事故象征,不要急于询问事故情况,以免占用调度电话,影响事故处理.
参考答案:对
It wasn’t until then _______ their marriage was breaking up because they had little in common.
A.did I realize
B.that I realized
C.had I realize
D.when I realized
下列物质中既含有共价键又含有离子键的是( )
A.NaI
B.CaCl2
C.NO2
D.KNO3