下列有关叙述不正确的是_刷题宝

题干

下列有关叙述不正确的是（）

A：拉瓦锡用金属汞测定空气中氧气含量

B：浓硫酸不小心沾到皮肤上，立即用大量水冲洗，再涂上3%—5%的碳酸氢钠溶液

C：青少年缺钙易患骨质疏松症，容易骨折

D：正常人体血浆的pH为7.35—7.45

上一题下一题 0.0难度选择题更新时间:2013-11-28 02:53:24

答案(点此获取答案解析）

C

同类题1

函数y= $\log_{\frac{1}{2}} |x + 2|$ 的增区间为（　　）

同类题2

下图中的两个小灯泡的连接方式是( )。

同类题3

已知BaCO₃和BaSO₄均为难溶电解质，其溶度积分别为Ksp（BaCO₃）=5.1×10^﹣⁹mol²•L^﹣²，Ksp（BaSO₄）=1.1×10^﹣¹⁰ mol²•L^﹣²，则下列说法中正确的是（）

同类题4

在等比数列{a_n}中，a₃=﹣12，前3项和S₃=﹣9，求公比q．

同类题5

根据短文理解, 从A、B、C三个选项中选择最佳答案填空。

Miss Richards was a teacher at a school for boys and girls. She 1 chemistry and physics from the lowest to the highest classes in the 2. Sometimes the new classes 3 rapidly, but sometimes they were very 4, and then Miss Richards had to 5things many times.

One year, the first class had been studying chemistry for several 6 when Miss Richards suddenly asked, "What is water? Who knows? 7 up!"

There was silence for a few seconds, and Miss Richards felt sad, but then one boy 8 his hand.

"Yes, Dick?" said Miss Richards encouragingly. He was not one of the brightest children in the class, so she was 9 that he could answer.

"Water is a liquid which has no 10 until you wash your hands in it, Miss. Then it turns black, "the boy replied with great confidence.

小学学科试题库

初中学科试题库

高中学科试题库