简述力平衡式压力变送器的工作原理？

阅读理解。

     This is Jim's room. It's small but very nice. There is (有) a chair, a desk and a bed in the room. A

computer and some books are on the desk. The bed is next to the desk. Under the desk, there is a

baseball. His computer game is under the bed. There is a photo of his family on the wall(墙). He likes his

room.

1. There is              in the room.  

A. a desk        

B. two desks      

C. three chairs

2.              are on the desk.

A. A book and a computer  

B. A computer and some books

C. Some books and some computers

3. There is               under the desk.  

A. a chair  

B. a computer game    

C. a baseball

4. There is               on the wall.

A. a photo of his classmates    

B. a photo of his teachers    

C. a photo of his family

5. The room is              .  

A. small      

B. nice        

C. small and nice

和谐社会的核心是创造( )的社会。

A．民主法治、公平正义、充满活力、安定有序、人与自然和谐相处

B．民主法治、公平正义、诚信友爱、安定有序、人与自然和谐相处

C．民主法治、公平正义、诚信友爱、充满活力、安定有序、人与自然和谐相处

D．民主法治、公平正义、诚信友爱，充满活力、人与自然和谐相处

Ⅰ．用MnO₂氧化密度为1.19g•cm^-3，溶质质量分数为36.5%的HCl溶液．反应的化学方程式为：MnO₂+4HCl

△ .

MnCl₂+Cl₂↑+2H₂O

（1）该盐酸的物质的量浓度为______mol/L．

（2）用双线桥法表示出该反应的电子转移方向和数目______．

（3）8.7gMnO₂能使______molHCl被氧化．

Ⅱ．在一定体积的18mol/L的浓硫酸中加入过量铜片，加热使之反应，若被还原的硫酸为0.9mol．则浓硫酸的实际体积______（填“大于”、“等于”或“小于”）100mL．若使剩余的铜片继续溶解，可在其中加入硝酸盐溶液（如KNO₃溶液），则该反应的离子方程式为______．

衣物等服装中通常（）对人体健康影响最大。

A、外衣

B、帽子

C、内衣

D、鞋子

将轴承压到轴上时（）

A.应通过垫套施力于内圈端面压到轴上

B.应通过垫套施力于外圈端面压到轴上

C.应通过垫圈施力于内外圈端面压到轴上