管线组装焊接时,管子对接的错口公差不应超过壁厚的()。
A.20%
B.5%
C.2%
D.10%
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John and I _____ friends for eight years. We first got to know each other at a Christmas party. But we ____ each other a couple of times before that.
A.had been; have seen
B.have been; have seen
C.had been; had seen
D.have been; had seen
精子和卵细胞产生后,参与繁殖过程的正确顺序是
①受精 ②肺泡植入子宫内膜 ③受精卵发育 ④排卵
A.①②③④
B.④③②①
C.④①③②
D.④②①③
根据支付结算法律制度的规定,商业汇票的付款期限,自汇票出票之日起,最长不得超过( )。
A.10日
B.1个月
C.3个月
D.6个月
柴胡、升麻都具有的功效是()
A.解表生津
B.清热解毒
C.疏肝解郁
D.透发麻疹
E.升举阳气
泛查电报的拍发时间为航班落地的()