下面是一个类的定义,请将程序补充完整。 import java awt.*; i

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问题:

下面是一个类的定义,请将程序补充完整。
import java awt.*;
import java applet.*:
public class myprogram extends Applet // 定义小程序的主类

Label p1;
TextField in:
publicvoidinit()
p1=new Label("请输入一个整数");
_______;
in=new TextField(8);
add(in);

考点:计算机等级考试JAVA二级JAVA笔试
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The population of the Earth is growing faster. It is important that we look after the Earth. We need it! The Earth gives us a lot of things. We also give the Earth a lot, but some of the things are not good.

In nature, when something dies, other animals and plants get food from it. Every animal or plant gives food for other animals or plants. However, animals can’t get food from many of the things that we ‘give’ the Earth. Animals and plants can’t eat metal, plastic and glass. These things will stay in the ground for many, many years.

Some rubbish is very dangerous for plants and animals. In some places, many animals live together. One animal makes food for many more animals. If we put rubbish and chemicals in the water, the plankton(浮游生物) can die. If there isn’t any plankton, many animals have nothing to eat.

So what can we do? Don’t leave any rubbish in the countryside! Don’t make so much rubbish!

小题1:The Earth gives us ___________.

A.food

B.rubbish

C.chemicals

D.pollution小题2:When something dies in nature, _________.

A.water and grass are polluted

B.plastic and wood become food

C.other animals and plants get food

D.metal and glass stay in the ground小题3:We must _______ to look after the Earth.

A.put metal in the ground

B.use more wood

C.keep frogs in the water

D.make less rubbish

题型:填空题

某工厂用软锰矿(含MnO2约70%及Al2O3)和闪锌矿(含ZnS约80%及FeS)共同生产MnO2和Zn(干电池原料):

已知①A是MnSO4、ZnSO4、Fe2(SO43、Al2(SO43的混合液.②IV中的电解反应式为MnSO4+ZnSO4+2H2O

电解
MnO2+Zn+2H2SO4

(1)A中属于还原产物的是______.

(2)MnCO3、Zn2(OH)2CO3的作用是______;II需要加热的原因是______;C的化学式是______.

(3)该生产中除得到MnO2和Zn以外,还可得到的副产品是______.

(4)如果不考虑生产中的损耗,除矿石外,需购买的化工原料是______.

(5)要从Na2SO4溶液中得到芒硝(Na2SO4•10H2O),需进行的操作有蒸发浓缩、______、过滤、洗涤、干燥等.

(6)从生产MnO2和Zn的角度计算,软锰矿和闪锌矿的质量比大约是______.

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下列属于姑息治疗中使用双磷酸盐类药物作用机制的是()。

A.促进钙质沉积

B.抑制成骨细胞活性

C.促进成骨细胞活性

D.抑制破骨细胞活性

E.抑制肿瘤细胞活性

题型:填空题

采用定额法计算产品成本时,若完工产品成本中的定额差异是正数,一般说明本月成本管理工作做得不好。

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