《煤矿安全规程》规定，井下人力运输爆炸材料时，（）必须由爆破工亲自运送。
A．炸药
B．电雷管
C．发爆器
参考答案：B
教师职业道德的主要范畴包括教师义务、教师良心、教师荣誉。（ ）
.---Would you have told him the answer had it been possible?
.---I would have, but I _____ so busy then.
A．had been
B．were
C．was
D．would be
