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问题 选择题
在同一直角坐标系内，如果正比例函数y=mx与反比例函数y=
p
x
的图象没有交点，那么m与p的关系一定是（　　）
A．m＜0，p＞0B．m＞0，p＞0C．mp＜0D．mp＞0
答案

∵正比例函数y=mx与反比例函数y=

p
x
的图象没有交点，

∴mx=

p
x
，

则mx2-p=0，

即0+4mp＜0，

mp＜0．

故选C．

单项选择题

感染艾滋病毒的孕妇在怀孕期可能会导致胎儿的感染，请问这种传播病原体的方式应称为（）。

A.血源性传播

B.医源性传播

C.水平传播

D.空气传播

E.垂直传播
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单项选择题

Serialization delay and (71) delay are the two components of network delay that are improved by increasing bandwidth. Serialization delay, i.e. the amount of time it takes to put the (72) on the wire, and queuing delay (depth of the queue) are improved by increasing the (73) from a 128Kbps circuit to a T1. However, three other components of delay, routing/switching deiay, distance delay, and protocol delay are components that can not be positively affected by an (74) in bandwidth. If the circuits are not over-utilized, then increasing the bandwidth to improve the (75) of the application will only result in an increased bandwidth with no positive effects on performance.

（73）是（）

A.memory

B.cache

C.bandwidth

D.delay
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