甲醇的化学式为CH3OH,某甲醇的水溶液中甲醇所含氢原子数与水所含的氢原子数相等

题型:选择题

问题:

甲醇的化学式为CH3OH,某甲醇的水溶液中甲醇所含氢原子数与水所含的氢原子数相等,则该溶液中溶质的质量分数是 [ ]

A、64%

B、47%

C、50%

D、无法判断

考点:关于溶液的计算
题型:选择题

阅读理解。

     Mr. and Mrs. Jones were going on their vacation  with their children, and they must arrive at the

airport before 11:40 the next morning. "It takes us thirty minutes to get there in a car," Mr. Jones said,

"so we must get ready before eleven o'clock. Don't be late."

     At ten-fifty, all of them were busy doing something, but Mrs. Jones wasn't. She sat quietly in a chair

in the garden and enjoyed the good weather.

     Mr. Jones and the children were surprised, but Mrs. Jones said, "Don't worry! Before I went to bed

last night, I made all our clocks and watches twenty minutes ahead (提前). Now we can get to the

airport early."

1. Why did the Jones family have to be ready before eleven o'clock?

A. Because they were going to a party.

B. Because they must arrive at the airport at 11:40.

C. Because they had to go to a town.

2. How long does it take to go from Mr. Jones' house to the airport by car?

A. Twenty minutes.

B. Thirty minutes.

C. Fifty minutes.

3. Mr. Jones and the children were _____ when they saw Mrs. Jones sitting in the garden.

A. sad

B. happy

C. surprised

4. Why did Mrs. Jones sit quietly?

A. Because she made all the clocks and watches ahead and they wouldn't be late.

B. Because she didn't like to spend her vacation.

C. Because she wanted to stay at home.

5. What time was it in fact when Mr. Jones and the children were busy doing things?

A. It was ten-fifty.

B. It was eleven-ten.

C. It was ten-thirty.

题型:选择题

张华被一道数学题给难住了,他没有求教于别人,而是自己用了一天的时间,终于解出了这道题,心里特别高兴。张华培养高尚情感的途径和方法是(   )

A.感受理智

B.体验道德

C.欣赏美好

D.心理放松

题型:选择题

什么是劳动法的原则?它在劳动关系的调整中具有怎样的作用?

题型:选择题

看小说时,能与主人公同喜同悲,体现的是一种()。

A、理解

B、移情

C、通感

D、沟通

题型:选择题

下面哪种笔记本电脑用电池无记忆效应?()

A.镍镉电池

B.镍氢电池

C.锂离子电池

D.燃料电池

更多题库