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【单选题】
有关①100mL 0.1mol/L NaHCO 3 ②100mL 0.1mol/L Na 2 CO 3 两种溶液的叙述不正确的是（ ）A.
溶液中水电离出的OH - 的个数：②＞①
B.
溶液中阴离子的物质的量浓度之和：②＞①
C.
①溶液中：c（CO 3 2- ）＜c（H 2 CO 3 ）
D.
②溶液中：c（HCO 3 - ）＜c（H 2 CO 3 ）
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【简答题】具有自锁的接触器正转控制电路同时具有____和____保护功能
【判断题】在具有过载保护的接触器自锁正转控制线路空载试车时,按下起动按钮后,用验电笔检测接线端子排XT处U、V、W三相电源时,验电笔应发光,但亮度可以不同。
A.
正确
B.
错误
【简答题】具有自锁的接触器正转控制电路同时具有____和____保护功能
【单选题】P: U4_3_3_1.mp3: Q3: How did inventors improve the original toilet according to the passage?
A.
They improved the pipes that were attached to the bottom.
B.
They added a knob on the chain to pull more easily.
C.
They improved the flush system to make it less water-consuming.
D.
They improved the collection bowl to make it more sanitary.
【单选题】Listen to five short conversations and choose the best answer to the question you hear. (p.125) 4 Q: How do young people socialize today according to the man? [音频]
A.
By hanging out with their friends.
B.
By chatting with others in person.
C.
By watching motives in the theatre.
D.
By communicating on the internet.
【单选题】The figure given below shows the market for MP3 p layers in a small country . D d and S d are the domestic demand and domestic supply curves of the MP3 players before the imposition of the quota. ( S ...
A.
B.
C.
D.
D
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