某种Na2S、Na2SO3、Na2SO4的混合物,测得其中含硫24%,求混合物中

题型:填空题

问题:

某种Na2S、Na2SO3、Na2SO4的混合物,测得其中含硫24%,求混合物中氧元素的质量分数______.

考点:物质组成元素的质量分数
题型:填空题

阅读理解。

  He is quiet and shy. He likes to hide his eyes behind his hair. He doesn't

smile very often. However,  if you talk to him about music, he'll have a lot to say.                  This is Jay Chou, the 24-year-old Taiwanese pop king(天王). His fans are

so excited because he will sing songs in Beijing on September 12. Those songs

are from his new album (唱片), "Ye Huimei", and the album was released

(发行) in July and was named after his mother.

  Chou grew up just with his mother. He did not talk much and did badly in

many school subjects.

  His mother noticed the boy's special interest in music and sent him to learn

piano when he was only three years old. He loved it and kept on practicing.

  Chou is not very handsome. He does not speak clearly when he sings or

talks. But the singer has huge crowds of fans. "He is really good at music. It

makes him attractive(有魅力的) to me, " said Liu Jiajun,  a Junior 2 student in

No. 101 Middle School in Beijing.

  "He is true to himself. He never follows others, "said Zhang Yujie, a Junior

1 girl at Huaibei Middle School in Sihong, Jiangsu Provice.

1. From this passage, we know that Jay Chou _____.

A. is very handsome            

B. has a bright smile

C. often makes too much noise    

D. is a pop music star

2. His fans are so excited because _____.

A. he released a new album in July  

B. he will sing new songs in Beijing

C. he can play the piano very well

D. his new album was named after his mother

3. When he was a little child, he _____.

A. talked a lot every day    

B. did well in his study at school

C. started to like music      

D. had huge crowds of fans

4. According to one of his fans, Jay _____.

A. is a good student        

B. has long and beautiful hair

C. is a well-known pianist    

D. is very attractive to them

5. The sentence "He never follows others" in the last paragraph means _____.

A. he always has his own style            

B. he likes to walk alone

C. he doesn't like other people's songs at all  

D. no one can catch up with him

题型:填空题

下图为人体内部分生理过程示意图,其中A、B、C表示物质,①、②表示过程。请回答:

(1)食物所含的六类营养成分中,不经过过程①直接进行过程②的有机物是是       

(2)在观察活体材料时,发现某血管只允许甲细胞单行通过,那么,该血管在结构上适于物质交换的特点是是       

(3)在肺泡内发生气体交换后,血液发生的变化是是       。物质B进入乙细胞后的作用是是       

(4)除A外,人体新陈代谢还产生许多其他废物,它们随血液流经肾单位时,经过是       和是       两个重要的生理过程形成尿液。

(5)如果C为葡萄糖,在正常情况下它在血液中的浓度保持相对稳定。某人空腹时的血糖浓度经常高于正常范围,最可能的原因是他体内的是       分泌不足。

(6)人体各项生命活动能够统一协调进行,有赖于是      的调节作用。

题型:填空题

固定连接体在基牙近远中面的接触区,其面积不应小于()。

A.5mm2

B.2mm2

C.6mm2

D.3mm2

E.4mm2

题型:填空题

第十一届全运会会徽以什么命名?()

A、全民体育,全民运动

B、和谐中华,活力山东

C、文明全运、和谐全运

D、和谐中国全民全运

题型:填空题

排出井场的废水的pH可在()之间。

A.6~7

B.6.5~7.5

C.6~8

D.6~9

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