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【单选题】
硼砂与水的反应是 : B 4 O 7 2- +5H 2 O=2H 3 BO 3 +2H 2 BO 3 - 用硼砂标定 HCl 时,硼砂与 HCl 的化学计量比为A.
1:1
B.
1:2
C.
1:4
D.
1:5
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反馈参考答案：
举一反三
【单选题】- What time are you going? - My plane leave at __________.
A.
twenty-five past seven
B.
ten and eight
C.
six past half
D.
half an hour
【单选题】听力原文：Woman: My plane is at seven, so I'll have to leave the office around five-thirty. That should give me enough time to get to the airport, don't you think? Man: Actually, I think you should leave e...
A.
4:00.
B.
5:00.
C.
5:30.
D.
7:00.
【单选题】— I’m going to Nanjing tomorrow. My plane leaves at 7:30 tomorrow morning. — .
A.
Is that so?
B.
How wonderful!
C.
Have a good trip.
D.
Well, goodbye.
【简答题】( ) 反馈系统的稳态误差和稳态偏差相同。
【单选题】-- My plane leaves at 7:25. -- _____
A.
OK.
B.
Well, goodbye and have a good trip!
C.
Why tell me?
D.
Remember to look me up.
【多选题】布线系统结构包括六个独立的子系统,分别是( )。
A.
工作区子系统
B.
水平子系统
C.
管理子系统
D.
垂直子系统
E.
建筑群（楼宇）子系统
F.
设备间子系统
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