计算题:已知:一斜铁高为5,长为30,求其斜度?

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问题:

计算题:已知:一斜铁高为5,长为30,求其斜度?

考点:机加取制样工考试机加取制样工(初级)机加取制样工(初级)题库
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(6分)(1)用化学用语表示:

①2个铜原子         ;   ②  3个氮分子         

③ 4个亚铁离子         ; ④氧化镁中镁元素显+2价         

(2)写出下列符号中“2”的含义

① H2O:  ____________      ________ ② Ca2+   ___________   ___________

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(B) What are you going to do if you are in a burning house?

Escaping(逃离) a fire is a serious matter. Knowing what to do during a fire can save yourself. It is important to know the ways you can use and to show them to everyone in the family, such as stairways (楼梯) and fire escapes, but not lifts(电梯).

From the lower floors of the building, escaping through windows is possible, learn the best way of leaving through windows with the least chance of serious injury (伤害).

The second floor windows are usually not very high from the ground. An average (普通的) person, hanging by the finger-tips will have a drop of about six feet to the ground. It is about the height of an average man. Of course, it is safer to jump a short way than to stay in a burning building.

Windows are also useful when you are waiting for help. Be sure to keep the door closed, or smoke and fire may be drawn into the room. Keep your head low at the window to be sure you get fresh air rather than smoke that may have leaked (渗入) into the room.

On a second or third floor, the best windows for escaping are those which open onto a roof . From the roof a person can drop to the ground more safely, dropping onto stones might end in injury.

小题1:From the beginning, we know that it is important to       .

A.know the way to escape a fire

B.put out a fire in a burning house

C.jump out of a burning house

D.keep the door closed小题2:It is possible to escape through the windows         .

A.if there are some stones on the ground

B.if there is some grass on the ground

C.if you live on a higher floor

D.if you have a short enough rope小题3:Which of the following is right according to the information in the passage?

You can escape through lifts.

You can choose fire escapes.

You can’t escape through stairways.

Keep your head high at the window to be sure you get fresh air.

小题4:Keep the door closed so that         if the building is on fire.

A.smoke and fire can’t be drawn into the room

B.you can call for help

C.you can get fresh air

D.you can be sent first小题5:The best title for the passage is          .

A.Escaping through the windows

B.Saving yourself from a burning house

C.Knowing on fire

D.Waiting for help

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下列说法中,不正确的一项是______。

A.Java程序有两类:Application和Applet
B.类的方法只能由public修饰
C.Java语言通过接口支持多重继承
D.面向对象的程序设计的优点有:可重用性、可扩展性、可管理性

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1980年黑泽明的()获嘎纳金棕榈奖。

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支气管哮喘与心源性哮喘的主要不同点是

A.肺部干湿性哕音多少

B.窦性心动过速情况

C.心前区有无收缩期杂音

D.心界是否扩大,是否有舒张期奔马律

E.有无肺气肿征

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