晶体管毫伏表测试频率范围一般为（）。A、500Hz～20MHzB、100Hz～10M

若线性表(24，13，31，6，15，18，8)采用散列(Hash)法进行存储和查找，设散列函数为Hkey)=Key mod 11，则构造散列表时发生冲突的元素为______(其中的mod表示整除取余运算)。

A．24和13

B．6和15

C．6和24

D．18和8

Every year there are hundreds of earthquakes in different parts of the world. In September, 1923, Tokyo and Yokohama were both destroyed by an earthquake and the fires that followed it. They had to be completely rebuilt. One of the most serious earthquakes was in China’s Shanxi province in 1556. It killed almost one million people.

We measure an earthquake’s strength on the Richter Scale. The Richter Scale was introduced in 1935 in Southern California in the USA. It measures earthquakes on a scale of one to ten. Any earthquake measuring five or more is usually serious.

The Earth’s crust(地壳) is made up of rock called plates. As these plates move, they sometimes crash against each other, causing the crust to quake. In cities such as Tokyo, where small quakes happen quite often, many modern buildings are designed to be flexible so when the Earth moves, they move with it.

Earthquakes can also break up gas and oil pipes. This can cause fires to break out, which can do as much damage as the earthquake itself.

Another effect of earthquakes is tsunamis. These are huge waves created by earthquakes beneath the sea. They can be many meters high and cause great damage to coastal towns and cities, China, Japan, Russia and the USA have the highest occurrence(发生) of earthquakes in the world.

小题1:The passage is mainly about       .

A．scientists who study earthquakes

B．the way of measuring earthquakes

C．a usual natural disaster

D．what people should do in the earthquake小题2:The earthquake in Shanxi Province       , which in NOT true?

A．happened in 1556

B．killed one million people

C．was the only earthquake in China

D．caused a lot of damage小题3: Earthquakes        

A．don’t cause much damage

B．are not serious

C．most possibly happen in Japan

D．happen all over the world小题4:According to the passage we know that tsunamis        .

A．can cause earthquakes

B．are caused by earthquakes

C．only happen on land

D．are a way of measuring earthquakes

国有企业改革按照产权清晰的要求，企业应拥有( )。

A．重大决策权

B．经营自主权

C．资产所有权

D．法人财产权

规格为（）的手提式电钻使用时，单靠双手推力还不够大，可利用后托架用胸部顶加压力钻较大较厚的孔。

A、6mm

B、8mm

C、10mm

D、13mm

当室性早搏出现在心电图的T波内时，容易诱发心室颤动，应紧急处理。其生理学基础为

A．在动作电位的平台期接受刺激
B．在动作电位的除极化时期接受刺激
C．相当于刺激落入复极化过程中的易损期
D．形成兴奋折返
E．相当于兴奋落在心肌的不应期内