汞在生产环境中的最高允许浓度为()。
A.10毫克/米3
B.20毫克/米3
C.30毫克/米3
D.0.01毫克/米3
参考答案:D
--- Hi, Torry, can I use your computer for a while this afternoon?
--- Sorry, _____________.
A.it is repaired
B.it has been repaired
C.it’s being repaired
D.it had been reapired
阵发性室上性心动过速宜选用
A.奎尼丁B.利多卡因C.普萘洛尔D.维拉帕米E.阿托品