以NA表示阿伏加德罗常数，下列说法中正确的是（） A．53g碳酸钠中含NA个CO3

发布时间：2017-05-14 11:37 │ 来源：www.tikuol.com

题型：选择题

问题：

以N_A表示阿伏加德罗常数，下列说法中正确的是（）

A．53g碳酸钠中含N_A个CO₃^2—	B．0.1molOH^—含N_A电子
C．1.8g重水(D₂O)中含N_A个中子
D．标准状况下11.2L臭氧（O₃）中含N_A个氧原子

考点：质量守恒定律

题型：选择题

阅读理解。

    Jim was five years old. On his birthday he got a lot of birthday presents from his family,and one of them
was a beautiful drum (鼓). It was from his grandpa.
   Jim liked his drum very much.He made a terrible noise with it, but his mother didn't mind. His father was
working during the day, and Jim was in bed when he got home in the evening, so he didn't hear the noise.
    But one of the neighbors didn't like the noise, so one morning a few days later, she took a sharp knife and
went to Jim's house while he was hitting his drum. She said, "Jimmy, do you know there's something nice
inside your drum? Here's a knife. Open the drum and see what it is."

1. Jim's gave him a drum on his birthday.

A. grandmother
B. mother
C. grandfather
D.father

2. liked the drum very much.

A. Jim
B. Jim's father
C. Jim's mother
D. Jim's neighbor

3. , Jim made a terrible noise with the drum.

A. Day and night
B. Only during the day
C. Only during the night
D. When his dad was at home

4. There was inside the drum.

A. something nice
B. a nice knife
C. nothing
D. a lot of things

5. The neighbor .

A. liked Jim very much
B. gave him a sharp knife as his birthday present
C. didn't want to hear the noise any more
D. told him to stop hitting the drum

查看答案

题型：选择题

2009年是达尔文的《物种起源》发表150周年，也是达尔文诞辰200周年。达尔文《物种起源》发表后，立即引起了宗教人士的强烈反对，下图为当时讽刺达尔文的漫画。下列相关说法正确的是

①科学战胜愚昧是一个艰难的过程②进化论的价值被人们广泛认识

③达尔文的生物进化论动摇了宗教神学的根基④自然科学开始从神学中解放出来

A．①②

B．①③

C．①④

D．③④

查看答案

题型：选择题

图为“碳循环示意图”。读图完成题。

小题1:图中字母A、B、C、D代表的圈层分别是

A．水圈岩石圈大气圈生物圈 B．水圈大气圈岩石圈生物圈

C．岩石圈水圈生物圈大气圈 D．大气圈水圈岩石圈生物圈

小题2:①过程可能导致

A．臭氧层破坏

B．生物种群增多

C．全球气候变暖

D．海平面下降

查看答案

题型：选择题

风化作用包含着外力对原岩发生的哪两种作用（）

A．机械破碎和风化作用

B．沉积作用和化学变化

C．机械破碎和化学变化

D．搬运作用和化学变化

查看答案

题型：选择题

苯丙酮尿症主要的治疗方法是()

A．四氢生物蝶呤(BH)

B．5-羟色胺

C．低苯丙氨酸饮食

D．低铜饮食

E．低蛋白饮食

查看答案

更多题库