灭火器虽未经使用,但自出厂之日起满二年时必须进行维修,以后每隔()年至少维修一次。
A、1
B、2
C、3
D、4
参考答案:A
I can’t remember ______ I met the man.
A.where was it
B.it was where
C.where it was that
D.where was it that
按配送时间及数量来分,配送可分为()。
A.定时配送
B.定量配送
C.定时定量配送
D.定时定路线配送
E.即时配送