下列叙述不正确的是(　　)_刷题宝

题干

下列叙述不正确的是(　　)

A：离子化合物可能含共价键

B：共价化合物不可能含离子键

C：离子化合物中只含离子键

D：共价化合物中只含共价键

上一题下一题 0.0难度选择题更新时间:2018-01-16 04:32:56

答案(点此获取答案解析）

C

同类题1

阅读理解。根据短文内容，选择正确答案。

The story is about two mice. They are friends. One mouse lives in the country. The other lives in the city. One day they meet each other. The one in the country says, “Come and have look at my house.” They come to a house in a field. The country mouse gives the city mouse nice food. But the city mouse says. “This food is not good. You must come and live with me inthe city.”

So they go to the house of the city mouse. It is a very good house. Nice food is ready (准备）for them to eat. But just when they begin to eat, they hear a great noise. “Run! Run! The cat is coming!” the two friends run away quickly. After some time, they go out. The country mouse says to the city mouse, “I don't like to live in the city. It's dangerous.”

同类题2

_____ from endless homework on weekends, the students now can have their own activities, such as taking a ride together to watch the sunrise.

同类题3

在一个容积为3 L的恒温密闭容器中，放入3 L X(g)和2 L Y（g），在一定条件下发生反应：4X(g) + 3Y(g)

2Q(g) + nR(g)，反应达平衡后，容器内压强比原来增加5%，X的浓度减少1/3，则n值可能为

同类题4

下列有关科学家的科学发现和所利用到的实验方法都正确的是（　　）

	科学家	科学发现	实验方法
A	沃森、克里克	DNA的半保留复制	假说演绎法
B	沃森、克里克	DNA的双螺旋结构	物理模型建构法
C	艾弗里	格里菲斯提出的“转化因子”是DNA而不是蛋白质	噬菌体侵染细菌实验
D	摩尔根	基因和染色体存在明显的平行关系	类比推理法

同类题5

以下说法判断正确的是( )

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