呼吸衰竭的血气诊断标准是（） A.动脉血氧含量低于9mmol/L B.动脉血氧饱

In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet.

In low - speed network, it is usually adequate to wait for congestion to occur and then react to it by telling the source of packets to slow down. In high - speed networks, this approach often works poorly, because in the (1) between sending the notification and notification arriving at the source, thousands of additional (2) may arrive. In ATM network, a major tool for preventing (3) is (4) control. When a host wants a new virtual (5) , it must describe the traffic to be offered and the service expected.

4（）

A．flow

B．admission

C．traffic

D．time

读“某区域不同等级城市服务半径示意图”，完成下列小题。

小题1:下列城市的服务半径与图示相符的一组是

A．大丰市—R1，东台市—R2，盐城市—R3

B．东台市—R1，南京市—R2，盐城市—R3

C．南京市—R1，盐城市—R2，东台市—R3

D．东台市—R1，盐城市—R2，南京市—R3小题2:关于A、C两类城市描述正确的是

A．C城市规模小，数目少

B．C城市服务范围大，服务种类少

C．A城市等级低，数目多

D．A城市服务范围小，服务人口多

确定银行贷款对象实质上就是确定贷款（）

A.投向

B.结构

C.规模

D.风险

接受者因受到艺术作品思想感情、理想愿望以及人物命运的打动感染而形成的一种强烈的心灵感应状态，称为______。

A．共鸣

B．净化

C．理解

D．领悟

简述已加工表面粗糙度的成因。