当天然水中的总碱度<总硬度时,水中既有永久硬度,又有暂时硬度,而无钠盐碱度。()
参考答案:对
补全对话。选出合适的句子填入画线处,使短文完整。
W: Hello.
M: Hi, Eve. This is Bob. 1
W: I'm watching TV.
M: 2
W: Yes, I do. What about you?
M: I don't like watching TV. Do you like movies?
W: Yes, I love them very much.
M: 3
W: I don't like watching the news.
M : Do you like soap operas?
W: 4 It's too boring.I like watching sitcoms.
M: 5
A. Do you like watching TV?
B. Me, too.
C. How about CCTV News?
D. What are you doing?
E. No, I can't stand it.
1._______2. _______3. _______4. _______5. _______
锅炉上的三大安全附件指的是()、()和()。