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【单选题】
n个水分子和m 个硫酸（H 2 SO 4 ）分子中，含有相同的是氧元素质量，则n与m的比为（ ）A.
1：4
B.
1：2
C.
4：1
D.
2：1
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【简答题】4S店展厅的功能有哪些?
【简答题】简述母畜流产的常见症状与表现?
【单选题】Japanese Car Keeps Watch for Drunk Drivers ?? Aconcept car developed by Japanese company Nissan has a breathalyzer-likedetection system and other instruments that could help keep drunk or over tireddr...
A.
It has a sensor system that could issue a warning if the driver is drunk
B.
It has sensors that detect traces of alcohol inside the car
C.
It has sensors locked up in the ignition system
D.
It has a breathalyzer-like detection system
【简答题】A．In the company's car. B．By taxi. C．In his friend's car. D．By bus.
【简答题】A．In the company's car. B．In his friend's car. C．By taxi. D．By bus.
【单选题】听力原文：W：Good morning，Sunny Car Rental Company．What Call I do for you? M：Good morning．This is Paul King calling from the Speed Company．We need a ear to the airport for Mr. Phillips tomorrow．His flight i...
A.
At 2:30 tomorrow.
B.
Before noon tomorrow.
C.
At 2:30 today.
D.
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【单选题】下列关于中枢性睡眠呼吸暂停综合征与阻塞性睡眠呼吸暂停综合征的区别，错误的是：（）
A.
中枢性睡眠呼吸暂停综合征多数有神经系统或运动系统的病变。
B.
阻塞性睡眠呼吸暂停综合征呼吸暂停时胸腹运动同时消失
C.
中枢性睡眠呼吸暂停综合征可与阻塞性睡眠呼吸暂停综合征同时出现
D.
单纯中枢性睡眠呼吸暂停综合征较少见
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