That is the only thing ______ I can do now.[ ]
A. how
B. what
C. which
D. that
答案:D
下表为4种常见溶液中溶质的质量分数和物质的量浓度.这4种溶液中密度最大的是
A.HCl
B.NaOH
C.CH3COOH
D.HNO3
发酵车间的生产设备为什么要消除跑冒滴漏?