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问题 单项选择题 共用题干题

女性，28岁，骑自行车时被汽车撞伤右大腿，大腿外侧有一3cm×5cm皮肤破损，有少量渗血，主诉右大腿剧痛，患者面色苍白，呼吸困难。

为病人测血压80/40mmHg，经输液后血压回升不明显，未发现其他出血部位，X线拍片显示右股骨干骨折，病人的失血量约为（）。

A.200ml

B.300ml

C.400ml

D.1000ml

E.2000ml

答案

参考答案：D

选择题

政府机构改革中要注意精兵简政，在这个问题上能给后人提供教训的朝代是

A．唐朝　　

B．隋朝

C．宋朝　　

D．明朝
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单项选择题

Although a given waveform may contain frequencies over a very broad range, as a practical matter any transmission system will be able to accommodate only a limited band of （） . This, in turn, limits the data rate that can be carried on the transmission （） . A square wave has an infinite number of frequency components and hence an infinite （） .However, the peak amplitude of the kth frequency component, kf, is only 1/k, so most of the （） in this waveform is in the first few frequency components. In general, any digital waveform will have （） bandwidth. If we attempt to transmit this waveform as a signal over any medium, the transmission system will limit the bandwidth that can be transmitted.

A square wave has an infinite number of frequency components and hence an infinite（）

A．source

B．bandwidth

C．energy

D．cost
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