以紫色洋葱鳞茎表皮为材料观察植物细胞质壁分离现象，下列叙述错误的是_刷题宝

题干

以紫色洋葱鳞茎表皮为材料观察植物细胞质壁分离现象，下列叙述错误的是

A：用高浓度的尿素代替蔗糖溶液不能引起细胞质壁分离

B：滴加30％的蔗糖溶液比10％蔗糖溶液引起细胞质壁分离所需时间短

C：发生质壁分离的细胞，细胞膜与细胞壁之间充盈着蔗糖溶液

D：在发生质壁分离的细胞中能观察到紫色中央液泡逐渐缩小，颜色加深

上一题下一题 0.0难度选择题更新时间:2017-12-08 12:02:09

答案(点此获取答案解析）

A

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识图探究“鸟适于飞行的特点”，你发现鸟适于飞行的特点有：

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下列物质中，能够导电的电解质是( )

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下列说法中，正确的个数是（　　）

①柱体的两个底面一样大；②圆柱、圆锥的底面都是圆；③棱柱的底面是四边形；

④长方体一定是柱体；⑤棱柱的侧面一定是长方形．

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阅读理解。
Beijing 2—day Tour( including hotel)

Departure date: every day
Departure time: 8:00 am
Return time: 6:00 pm
Tour guide serve(服务): English-speaking tour guide

Day 1 Arrive in Beijing
After arriving in Beijing, you will be taken to a hotel.Then you'll be free the rest of the day.

Day 2 Visit the main places of interest
Pick-up service by your tour guide and driver in the morning.
In the morning: Visit Tian'anmen Square, including the main buildings such as the National Museum of China and the Great Hall of the people.Visit the Temple of Heaven and the Forbidden City.Then you'll have lunch at a local restaurant near the Forbidden City.
In the afternoon: Visit the Summer Palace, the largest and most beautiful imperial(皇帝的) garden in China.
After the tour is over, you will be sent to Beijing Capital Airport.

Tour price (each person in US dollar)

Your group size	Super class★★★★★	Deluxe class★★★★	Tourist class★★★
1 person	＄230	＄188	＄150
2-5 people	＄135	＄115	＄95
6-9 people	＄123	＄95	＄85
10 people or over	＄115	＄92	＄80

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下列说法正确的是（）

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