如图是通电分解水的简易装置．据图回答： （1）电源正极相连的试管内的气体体积与电

读短文，回答问题。

      Peter went to the library yesterday. He got up early and went to the library after breakfast. Usually Peter

goes to the library by bus and that day he had a new idea. He went on his new bike.

      In the library he saw some new science books and he really wanted to read them all but he couldn't. He

could only have three books at a time.

      He took the books and walked out of the library. He went to his bike but he couldn't open it with his key.

What was wrong? He looked at the key and then looked at the bike. Oh, no. It wasn't his. His bike was next to

it on the right!

1. How does Peter usually go to the library?

______________________________________________________

2. How did Peter go to the library that day?

______________________________________________________

3. What did Peter see in the library?

______________________________________________________

4. Why he couldn't open the bike?

______________________________________________________

函数y=a^x-2+1（a＞0且a≠1）的图象必经过点（　　）

A．（0，1）

B．（1，1）

C．（2，0）

D．（2，2）

冬天人们常用两手搓擦取暖，这表明通过_________方式可以改变物体的内能；用热水袋也能给手取暖，这表明通过________方式可以改变物体的内能．

简述井下三角高程测量分级、限差及适用范围。

根据测绘法，降低测绘资质等级、暂扣测绘资质证书、吊销测绘资质证书的行政处罚，由（）决定。

A.国务院测绘行政主管部门

B.省级测绘行政主管部门

C.县级以上测绘行政主管部门

D.颁发资质证书的部门