书写下列反应的化学方程式: (1)加热高锰酸钾制氧气______ (2)白磷自燃

题型:填空题

问题:

书写下列反应的化学方程式:

(1)加热高锰酸钾制氧气______

(2)白磷自燃______

(3)铁丝在氧气中燃烧______

(4)二氧化碳使澄清石灰水变浑浊______.

考点:化学反应方程式的书写文字表达式
题型:填空题

Cushing病最多见的垂体病变是()

A.微腺瘤

B.小腺瘤

C.大腺瘤

D.恶性肿瘤

E.转移瘤

题型:填空题

阅读理解

     Nuclearpowered aircraft carriers are considered one of the most important marine weapons in the

20th century. So far, only two countries in the world, the USA and France, have ever produced them.

But these fearful fighting machines are about to enter Asia.

     The US Navy said last month that one of its nine nuclearpowered aircraft carriers will be sent to

Japan to replace the diesel(柴油)powered carrier Kitty Hawk in 2008. In an agreement on October

30, the two countries also planned to level up their military (军事的) cooperation and the USA called

for Japan to take a larger role in alliance military moves.

     It will be the first time that a nuclearpowered carrier is based in Japan. Bombed by US forces in

World War ? at Hiroshima and Nagasaki, Japan is the only world country to have been attacked by a

nuclear weapon. Therefore, the citizens are highly sensitive to where nuclearpowered weapons are

based.

      "A radiation leak at Yokosuka would kill 100,000 people as far away as Tokyo, and could cause

billions of dollars in damage," said Masahiko Goto, leader of a protest group in Yokosuka. His group

has collected more than 300,000 signatures of people across Japan opposed to the nuclear carrier.

     The 44yearold Kitty Hawk, the US Navy's oldest active ship, has been based in Yokosuka since

1998. It had returned to the US to be decommissioned in 2008. The new carrier, yet to be unveiled,_

will travel faster, be capable of supporting longer operations and carry with it the Navy's most modern

technology.

     Experts pointed that this change is not only to strengthen the USJapan military alliance but also to

keep the military power of China and North Korea within limits. However, even Japanese experts don't

believe that the two countries are threats to the region.

     "There is no need for Japan to have a nuclear carrier as defense," said Tetsuo Maeda, an international

relations professor at Tokyo International University. He said that the change of ship indicates an

increased military capability in the region, much more than what is needed.

1. With such a formidable weapon to enter its country, Japanese citizens ________.

A. are aware of its benefits to the country

B. are anxious about its potential danger

C. are curious about the advanced technology

D. are against where the carrier will be based

2. The replacement of the aircraft carrier is intended to________.

A. set up a kind of base in Japan

B. strengthen the USJapan military alliance

C. show Japan's greater military capability

D. get rid of the dated marine weapon

3. From the story, we learn that________.

A. no other countries except the USA and France possess aircraft carriers

B. Japan has long planned to increase its military capability with new weapons

C. Japan will be the first country in Asia to have a nuclear aircraft carrier

D. Japan will be the third country to produce a nuclearpowered aircraft carrier

4. The underlined word "unveiled" in the fifth paragraph probably means________.

A. perfected  

B. discussed about

C. produced  

D. brought to view

题型:填空题

为了测定某铜银合金的成分,将30.0 g合金完全溶解于80.0 mL 13.5 mol/L的浓硝酸中,收集到6.72 L(标准状况)的气体,并测得溶液中c(H+) =1 mol/L,假设反应前后溶液的体积不变(反应生成气体只有NO和NO2)。试计算:

(1)被还原的硝酸的物质的量。

(2)合金中银的质量分数。

(3)气体中NO、NO2的体积比。

题型:填空题

主冷油器冷却水从()来进行冷却。

A、循环水泵出口门

B、循环水滤网前

C、循环水滤网后

D、前池入口

题型:填空题

从所给的四个选项中,选择最合适的一个填入问号处,使之呈现一定的规律性。()

A.A

B.B

C.C

D.D

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