煤气爆发实验,必须至少连续作()次合格后方可使用。
A.2
B.5
C.3
参考答案:C
He thought this was the first pair of shoes that had fitted him ________.
A.perfectly
B.justly
C.fairly
D.rightly
供电方案的有效期,是指从供电方案正式通知书发出之日起至受电工程()为止。
A、开工日
B、竣工日
C、验收日
D、送电