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【简答题】
PM2.5指大气中直径小于或等于2.5微米的颗粒物，也称为可入肺颗粒物。珠江三角洲是全国第一个将PM2.5纳入空气质量评价并率先公布数据的城市群地区。图为2012年3月16日7时广东省环境监测中心发布的珠三角地区PM2.5均值分布图，读图回答题。 小题1:下列四城市中，空气质量最好的是 A．佛山 B．广州 C．珠海 D．惠州 小题2:导致图中珠三角PM2.5浓度偏高的原因，不正确的是 A．人口稠密、汽车数量大 B．城市化水平高，森林绿地比重低 C．经济发达，工厂企业多 D．强冷空气南下，气温下降
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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
【单选题】What does 'S.P.Q.R.' suggest according to the text?
A.
It suggests that The Roman Senate was elected by the people and governed the people.
B.
It suggests that The Roman Senate was the highest authority.
C.
It suggests that it was the people, not government, who held the power and right of the country.
D.
It suggest that the Roman Republic functioned a democracy the same as America.
【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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