下列说法不正确的是{"A":"\u6ca1\u6709\u987a\u53cd\u5f02\u6784\u4f53","B":"1\uff0c3\ufe63\u4e01\u4e8c\u70ef\u53ef\u4ee5\_刷题宝

题干

下列说法不正确的是（　　）

A：没有顺反异构体

B：1，3﹣丁二烯可以作为合成高分子化合物的原料

C：用乙醇和浓硫酸制备乙烯时，用水浴加热控制反应温度

D：常温下，将苯酚加入到少量水中有浑浊，滴入适量NaOH溶液后浑浊消失

上一题下一题 0.0难度选择题更新时间:2019-08-07 06:32:13

答案(点此获取答案解析）

C

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某学生设计的下列四个实验方案中，理论上正确、操作上可行、经济上合理的是（）

同类题2

实验室用少量的溴水和足量的乙醇制备1，2﹣二溴乙烷的装置如图所示：

	乙醇	1，2二溴乙烷	乙醚
状态	无色液体	无色液体	无色液体
密度/g•cm^﹣³	0.79	2.2	0.71
沸点/℃	78.5	132	34.6
熔点/℃	﹣130	9	﹣116

请回答下列问题：

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每年的3、4、5月是北半球的( )

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如图所示，一根长为0.2m的金属棒放在倾角为θ=37°的光滑斜面上，并通以I=5A电流，方向如图所示，整个装置放在磁感应强度为B=0.6T，竖直向上的匀强磁场中，金属棒恰能静止在斜面上，则该棒的重力为多少？

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Car Services

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The building which saves people from bad weather.

This building near the sea in New Orleans looks like something from a scifi film (科幻电影). It is over 360 meters high, and is designed to house up 40,000 people, named the Noah. This building is strong enough to avoid the damages of bad weather.

Beach Cleanup Day

We need volunteers to clean the beach！

Sunday, July 20

Meet at 8:30 a.m. at Coast Square.

Start at 9:00 a.m. and end at noon.

Bring bags and gloves.

For more information, call Zhang Lin at 564-0657.

Apartment to Rent (出租)

A new apartment to be rented in the city centre. One bedroom and one kitchen. Near the bus station, at No. 22 Changjiang Road. Buses pass the front gate.

If you are interested, please have a look at the apartment or you can call Mrs. Yu at 2747130.

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