MDEA的有哪些性质?
参考答案:
(1)MDEA即N-甲基-二乙醇胺,是一种无色液体.
(2)在一定条件下呈弱碱性,化学性质稳定,对碳钢基本不腐蚀.
A.4A
B.2A
C.0.5A
D.0.25A
The question of drug-taking is bound to (一定要) ______ at the next conference.
[ ]
A. come up
B. be come up
C. come up with
D. be coming up