问题
单项选择题
锅炉的化学清洗一般包括碱洗、酸洗、漂洗和（）等工艺过程。
A、纯化
B、下降
C、不变
答案
参考答案：A
搜题请搜索小程序“爱下问搜题”
锅炉的化学清洗一般包括碱洗、酸洗、漂洗和（）等工艺过程。
A、纯化
B、下降
C、不变
参考答案：A
| 从方框中选择适当的句子不全对话。其中有两项是多余的。 | |
| A: Excuse me, may I ask you some questions? B: Certainly. A: 1 B: I cat them every day. A: Do you like them? B: 2 13ut my parents say they're good for my health. A: Do you like junk food? B: 3 But I try to eat it once a week. A: Why? B: 4 A: How long do you sleep every night? B: 5 A: Oh, I think you must be in good health.
| |
| 1. _____ 2. _____ 3. _____ 4. _____ 5. _____ |