给水聚丙烯管道严密性试验:记录强度试验合格后()小时的压力,此压力比强度试验结束时的压力下降不应超过0.02MPa。
A.1
B.2
C.3
D.5
参考答案:B
TV provides the daily news but magazines offer us information that can be kept for a long time.
痫病与五脏均有关联,但主要责之于()
A.肺、脾
B.肝、肾
C.心、肝
D.肺、肾
E.肝、脾