决策方案的种类有()
A.积极方案
B.程式方案
C.应变方案
D.稳定方案
E.临时方案
参考答案:A, C, E
If your father _ alive, how happy he would be to see youl [ ]
A. is
B. was
C. were
煤气设备检修动火必须做到:()
A、提前三天办好手续、关好截门卡死盲板
B、专人联系彻底清扫
C、检查合格做防爆试验