在一次命令执行过程中，可以重复进行同样对象绘制的命令是？（）

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问题单项选择题

A、ELLIPSE椭圆

B、POLYGON正多边形

C、DONUT圆形

D、SPLINE样条曲线

答案

参考答案：C

单项选择题

SDLC was invented by IBM to replace the older Bisynchronous protocol for wide area connections between IBM equipment. A varietion of the (71) protocol called NRM is essentially the same as SDLC. SDLC is (72) protocol like HDLC, Frame Relay or X.25.An SDLC network is made up of (73) that controls all communications, and (74) . It is capable of (75) operation, but almost all practical applications are strictly half duplex.

A．HDLC

B．Frame Relay

C．X.25

D．X.21

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单项选择题

下列对诗歌《再别康桥》所抒发的情感的概括最恰当的是（）

A．抒发了因“康桥理想”的幻灭而无限哀伤的情怀

B．抒发了诗人对林徽因的无限思念之情

C．表现了诗人对黑暗现实强烈的不满情绪

D．表达了诗人强烈地希望在康河的柔波里作一条水草的愿望

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