纠正违章时为什么先敬礼？

亚氨基锂 (Li₂NH) 是一种储氢容量高、安全性好的固体储氢材料，其储氢原理是：Li₂NH ＋H₂ ＝ LiNH₂ ＋ LiH 。下列叙述中正确的是 [ ]

A．此法储氢和钢瓶储氢原理相同

B．Li⁺ 和 H⁺ 的离子半径相等

C．该反应中H₂既是氧化剂又是还原剂

D．金属锂在空气中燃烧生成 Li₂O₂

Australia is the smallest continent in the world. It is a little smaller than China. It is on the Southern Hemisphere of the earth. Australia is big, but its population is small. The population of Australia is nearly as large as that of Shanghai.

Enough laws have been made to fight against pollution. The cities in Australia have little air or water pollution. The sky is blue and the water is clean. You can clearly see fish in the rivers. Plants grow very well.

Last month we visited Perth, the biggest city in Western Australia, and went to a wild flower exhibition. There we saw large numbers of wild flowers on show, most of which we had never seen before. We had a wonderful time. Perth is famous for its beautiful wild flowers. Every year in spring Perth has a wild flower exhibition. After visiting Perth, we spent a day in the countryside. We sat down and had a rest near a path at the foot of a hill. It was quiet and we enjoyed ourselves very much. When we heard bells ringing at the top of the hills, we looked up, but what we saw made us pick up all our things and run back to our car as quickly as we could. There were about three hundred sheep coming towards us along the path.

Australia is famous for its sheep and kangaroos（袋鼠）. After a short drive from any town, you will find yourself among the white sheep. Sheep, sheep, everywhere you can see sheep.

小题1:Which country is the writer most possibly from?

A．Japan

B．Canada

C．China

D．America小题2:We can learn from the passage that _________.

A．Australia is the smallest country in the world

B．Australia is the same size of Shanghai.

C．Australia is in the northern part of the earth.

D．The people in Australia are as many as those in Shanghai.小题3:Which of the following statements is NOT true according to the passage?

A．Australia has enough laws to fight against pollution.

B．Perth is the biggest city in Australia.

C．The wild flowers in Perth must be different from what the author sees in his/her country.

D．The author enjoyed his/her visit in the country.小题4:The underlined word “exhibition” in the third paragraph means _________.

A．a public show for people to visit

B．a market where you can buy all kinds of flowers

C．a place where all kinds of flowers are grown

D．a field where there are flowers and animal

十灰散与小蓟饮子除止血外，相同的功用是

A．凉血

B．清肠

C．养血

D．泻火

E．疏风

准备工作

采煤机检修后牵引部容积效率试验在额定牵引速度下，油温为50±5℃时，加载到额定压力，记录空载和额定压力下的输出轴转速，正反各测一次，并计算容积效率，其值不低于80%。（）