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【多选题】
黄铜焊接时，在焊接区形成的白色烟雾不是由于()。A.
铜的蒸发
B.
锌的蒸发
C.
产生了锰的蒸汽
D.
产生了氟化氢有毒气体
E.
铜氧化后与CO反应，析出了CO2气体
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举一反三
【单选题】According to the author, Information Technology______.
A.
brings people closer to each other
B.
results in silence among her fellow classmates
C.
enables us to reach anyone swiftly
D.
helps to make the world a global village
【简答题】判断以下程序段的正误,若有错,说明错误原因: if(age>=65) ; cout<<"Age is greater than or equal to 65"<
【单选题】要去掉轮廓色,正确方法是:( C)
A.
点击鼠标右键并选择白色
B.
点击鼠标右键
C.
选择左边工具栏的“轮廓工具(Outline Tool)”中“无轮廓工具(No Outline)
D.
双击鼠标左键
【单选题】要去掉轮廓色,正确方法是: ( )
A.
点击鼠标右键并选择白色
B.
B 、点击鼠标右键
C.
C、选择左边工具栏的“轮廓工具(Outline Tool)”中“无轮廓工具(No Outline)
D.
D、双击鼠标左键
【简答题】判断以下程序段的正误,若有错,说明错误原因: int y=10; while(y>0) { cout<
【单选题】要去掉轮廓色,正确方法是:( )
A.
点击鼠标右键并选择白色
B.
点击鼠标右键
C.
选择左边工具栏的“轮廓工具(Outline Tool)”中“无轮廓工具(No Outline)
D.
双击鼠标左键
【单选题】The author brings in the example of a parent striving to make life better for his children to make the point that ______.
A.
individual motivation would be destroyed by uniforms
B.
parents love their children
C.
uniforms cause dissension between parents and children
D.
parents have responsibilities to their children
【单选题】The author brings up the topic of the international space station in order to______.
A.
continue to stress the idea that what was previously thought impossible is now being achieved
B.
indicate the next great achievement to be accomplished in the space program
C.
demonstrate that the 'Space Race' is now a cooperative effort between nations
D.
convince the reader that the 'space program is producing positive results
【简答题】判断以下程序段的正误,若有错,说明错误原因: //本程序段实现求1+2+...100之和 int x=1,total=0; while(x<=100) total+=x; ++x; cout<
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【简答题】判断以下程序段的正误,若有错,说明错误原因: if(age>=65) ; cout<<"Age is greater than or equal to 65"<
【简答题】判断以下程序段的正误,若有错,说明错误原因: int y=10; while(y>0) { cout<
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