什么是钢的屈服强度，极限强度和持久强度？

In the Charles E.Johnson Elementary School in New York, there is a special radio. It gives people warnings（警报）about bad weather.

One day, there came a sound from the radio. This sound brought the piece of news:a heavy storm was coming. William Tomic, principal（校长）of the school, asked teachers to bring children indoors and put them in a safe place at once.

Minutes later, the storm came. However, because of the warning of the radio and the quick work of the principal, no one was hurt.

“The radio really did work very well.              （我们对它的工作感到很高兴），”William Tomic said. “The parents were as well.”

The U.S. government hopes there will be more such success stories. It plans to give this kind of radios to all 97,000 public schools in the country.

Every year, more than 10,000 big thunderstorms, 2,500 floods, 1,000 tornadoes（龙卷风）and some hurricanes（飓风）take place in the U.S., so the waming radios are very useful.They not only give people warnings about bad weather,but also give warnings about other dangerous things.

（一）请根据短文内容，简要回答下列问题.

小题1:What does the special radio give people?

小题2:Why was no one hurt in the school in the storm?

（二）请根据短文中所给汉语完成句子。

小题3:

（三）请把短文中划线的句子译成汉语。

小题4:

（四）请给短文拟一个恰当的英文标题。

小题5:

致病菌常规检查法一般不包括（）

A.直接涂片镜检

B.基因序列分析

C.生化试验

D.药物敏感试验

E.分离培养

历史上“北大荒”曾是一片湿地，建国后为增加粮食生产，“北大荒”变成了“北大仓”。现在有人主张“北大荒，就让它荒”。据此回答1、2题。

1．“北大仓”盛产的重要农产品是[ ]

A．大豆

B．青稞

C．油菜

D．棉花

2．现在有人主张“北大荒，就让它荒”，恢复为湿地。关于湿地的生态功能，描述正确的是[ ]

A．将过多的降水储存起来，起到抗洪防旱的作用

B．调节气候，降温增湿

C．防风周沙，保护农田

D．多种珍稀动物的栖息地

熔断器的选择原则有( )。

A．熔断器的额定电压应大于或等于回路的额定电压
B．对于熔断器的合闸回路，其熔体的额定电流按0.25～0.3倍额定合闸电流来选择
C．对于蓄电池组出口回路的熔断器，其熔体一般按蓄电池1h放电电流值再加大一级来选择
D．各级熔断器问应相互配合，具有选择性，每级熔断器熔体的额定电流值一般相差2～3级

下列关于计算机的叙述中，不正确的一条是

A．高级语言编写的程序称为目标程序

B．指令的执行是由计算机硬件实现的

C．国际常用的ASCII码是7位ASCII码

D．超级计算机又称为巨型机