题目内容

散射辐射随太阳高度角的增大而增大，随大气透明度变小而减小，随云量增多而减小

A. 对
B. 错

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AUTOCAD2010图形文件和样板文件的扩展名分别是:

A. DWT,DWG
B. DWG,DWT
C. BMP,BAK
D. BAK,BMP

重新执行上一个命令的最快方法是:

A. 按ENTER键
B. 按Ctrl键
C. 按ESC键
D. 按F1键

Coronary heart disease happens without warning, even if the patient has passed a stress test.

A. 对
B. 错

A stress test can observe if the patient has limited the blood flow in his heart.

A. 对
B. 错