. ________ on the subject for half an ho_爱下问搜题

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问题选择题

.

________ on the subject for half an hour, Liu Ying suddenly stopped.

A．To be worked

B．To work

C．Having worked

D．Having been worked

答案

答案：C

单项选择题

下列程序的输出图形是( )。
For k=0 To 360
cr=Int(160 * Rnd)
ang=-3.1415926/180*k
Circle(2000，2000)，500，cr,0，ang
Next

A．一段彩色圆弧

B．一个彩色扇形

C．一个彩色空心圆

D．一个辐射状彩色圆形

单项选择题

肠系膜上动脉一般与腹主动脉前壁间呈一角度，正常不应超过

A．90°

B．80°

C．60°

D．50°

E．30°