【简答题】下列物质中属于酸的是( ) A.NaHSO 4 B.H 2 SO 4 C.CH 3 COOH D.C 2 H 5 OH
【多选题】Sheng in Beijing opera include ______.
【单选题】When you rehearse timings, you should:
A.
skim over the content of each slide.
B.
read the entire content of each slide and look carefully at pictures and diagrams.
C.
allow yourself a set amount of time to view each slide regardless of its content.
D.
look only at the slide titles.
【简答题】下列物质中属于酸的是( ) A.Na 2 SO 4 B.NaHSO 4 C.H 2 SO 4 D.NaOH
【单选题】对物质进行分类是化学学习中的常用方法。下列物质中属于酸的是
【简答题】When you rehearse your speech, which statement is NOT correct?.A. Time your speech. B. Rehearse your speech quietly. C. Invite your friends to listen and give feedback. D. Don’t be shy.
【单选题】下列物质中属于酸性氧化物但不溶于水的是( )