混凝土中引气剂掺量一般为水泥质量的()。
A.1.5%~2.5%
B.1.5‰~2.5‰
C.0.5‰~l.5‰
D.0.05‰~0.159‰
参考答案:C
根据首字母及句意补全单词。
1. Manuel likes painting. He wants to be a great a .
2. My dream job is to be a p . So I can fly in the sky like a bird.
3. After the old man r , he looked after his grandson every day.
4. I always make New Year's r every term.
5. It's very necessary for a student to learn a f language well.
实行强制性产品认证的消防产品目录由()审核批准。
A、公安部
B、公安部消防局
C、国家认证认可监督管理委员会
D、公安部消防产品合格评定中心