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进入什么样的井场车辆排气管处必须加装防火帽？

答案

参考答案：

打开油气层的井；高压油气井、含H2S井；以及井队提出要求的井场。

阅读理解
阅读理解。
     March 14 is International Police Day.   1   No matter if it's burning hot or icy cold, a holiday or a school
day, you'll see policemen at the centers of the crossroads directing traffic.   2   
     There are more than 1.7 million policemen in China.   3   Other police have different responsibilities (责任).
Some are firefighters (消防员). Some watch out for bad guys and solve crimes. Others keep the peace.
Special police deals with unexpected events.   4   He has to learn laws, science, shooting, driving and climbing.
     To keep people safe and make peace for all, Chinese police put their lives at risk.   5   Another 13,000 were
injured in doing their jobs.
A. It is a day for people to show their respect for police, the people who keep millions of families safe.
B. A good special policeman needs a strong body as well as rich knowledge and many skills.
C. Since 1980, more than 7,000 policemen have lost their lives.
D. The traffic police is just one group.
E. These are the traffic police.
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填空题

[说明] 编写一个完整的JavaApplet 程序使用复数类Complex 验证两个复数1+2i 和3+4i 相加产生一个新的复数4+6i。 复数类Complex 必须满足如下要求： (1) 复数类Complex 的属性有： RealPart: int 型，代表复数的实数部分 ImaginPart: int 型，代表复数的虚数部分 (2) 复数类Complex 的方法有： Complex()：构造函数，将复数的实部和虚部都置0 Complex (intr，inti)：构造函数，形参r为实部的初值，i为虚部的初值。 ComplexeomplexAdd (Complexa)：将当前复数对象与形参复数对象相加，所得的结果仍是一个复数值，返回给此方法的调用者 String ToString()：把当前复数对象的实部、虚部组合成s+ bi 的字符串形式，其中a和b分别为实部和虚部的数据。 importjava. applet. * ; importjava. awt. * ; publicclassabcextends Applet { Complex a, b, c; publi cvoid init( ) { a = newComplex(1,2); b = newComplex(3,4); c = newComplex(); } publievoidpaint (Graphicsg) { (1) g. drawstring( “第一个复数：” + a. toString(), 10,50); g. drawstring( “第二个复数：” + b. toString( ), 10,70 ); g. drawstring( “两复之和：” + c. toString( ), 10,90); } } class Complex { int RealPart; int ImaginPart; Complex( ) { (2) } Complex( intr , inti) { (3) } ComplexeomplexAdd (Complexa) { Complextemp = newComplex( ); temp. BealPart = RealPart + a. BealPart; (4) returntemp; } public StringtoString( ) { return( RealPart + " + " + ImaginPart + " i "); } }
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