CBG017使用手钢锯锯割时,要随时调整锯条松紧度,碟形螺母旋得太紧或太松()
A.不能多次
B.开始时不能
C.不宜
D.不能一次
A.不能多次
B.开始时不能
C.不宜
D.不能一次
第5题
第6题
A、CheckboxGroupcbg=newCheckboxGroup()Checkboxone=newCheckbox("One",cbg,false)
B、CheckBoxtwo=newCheckbox("Two",cbg,false)
C、CheckBoxthree=newCheckbox("Three",cbg,true)
D、CheckboxGroupcbg=newCheckboxGroup()Checkboxone=newCheckbox("One",cbg,true)
第7题
已知TG=450K,cBG/cAG=0.5,TS-TG=10K,(kGam)A=(kGam)B=40m3/(g·s),k1
=6.0×108exp[-E1/(RT)][cm3/(g·s)],k2=1.2×106exp[-E2/(RT)][cm3/(g·s)],E1=80.0kJ/mol,E2=60.0kJ/mol。试求反应选择性。
第8题
第10题
注意:不改动程序的结构,不得增行或删行。
程序运行结果如下:
import java.awt.*;
import java.applet.*;
/*
<applet code="ex13_3.class" width=800 height=400 >
</applet>
*/
public class ex13_3 extends Applet{
private Button btnClear;
private CheckboxGroup cbg;
private Checkbox chk1, chk2;
private int upX, upY;
private int downX, downY;
private boolean bDraw, bClear, bStyle;
public void init(){
bDraw = false;
bClear = false;
bStyle. = false;
setLayout(null);
cbg = new CheckboxGroup();
chk1 = new Checkbox("Hollow", cbg, true);
chk2 = new Checkbox("Filled", cbg, false);
chk1.reshape(80,getSize().height-80,80,25);
chk2.reshape(160,getSize().height-80,80,25);
add(chk1);
add(chk2);
btnClear = new Button("clear");
btnClear.reshape(240,getSize().height-80,80,25);
add(btnClear);
}
public void paint(Graphics g){
if(bDraw){
if(upX > downX && upY > downY){
if (bStyle)
g. fillRect (downX, downY, upX - downX, upY - downY);
else
g.drawRect(downX, downY, upX - downX, upY - downY);
}
else if(upX > downX && upY < downY){
if(bStyle)
g.fillRect(downX, upY, upX - downX, downy - upY);
else
g.drawRect(downX, upY, upX - downX, downy - upY);
}
else if(upX < downX && upY > downY){
if(bStyle)
g.fillRect(upX, downY, downX - upX, upY - downY);
else
g.drawRect(upX, downY, downX - upX, upY - downY);
}
else if(upX < downX && upY < downY){
if(bStyle)
g.fillRect(upX, upY, downX - upX, downy - upY);
else
g.drawRect(upX, upY, downX - upX, downy - upY);
}
bDraw = false;
}
if(bClear)(
g.clearRect(0,0, getSize().height, getSize().width);
b
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