通过甲状腺素促进蛋白质合成的元素是()
A．锌
B．铜
C．铁
D．钙
E．碘
参考答案：E
自动喷水系统系统当管道公称直径≥50mm时，配水干管上设置防晃支架的间距不宜大于()
A.30m
B.20m
C.15m
D.5m
I don't think she will agree with us, _ ?
A．will she
B．won't she
C．don't you
D．do you
