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问题 单项选择题

当轮胎式起重机带载行走时，道路必须平坦坚实，荷载必须符合规定，重物离地面不得超过( )，并应拴好拉绳，缓慢行驶。

A．400mm
B．450mm
C．500mm
D．550mm

答案

参考答案：C

单项选择题

CHAP协议是PPP链路中采用的一种身份认证协议，这种协议采用___19___握手方式周期性地验证通信对方的身份，当认证服务器发出一个挑战报文时，则终端就计算该报文的___20___并把结果返回服务器。

20（）

A．密码

B．补码

C．CHAP值

D．Hash值
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单项选择题

Demographers doing research for an international economics newsletter claim that the average per capita income in the country of Kuptala is substantially lower than that in the country of Bahlton. They also claim, however, that whereas poverty is relatively rare in Kuptala, over half the population of Bahlton lives in extreme poverty. At least one of the demographers’ claims must, therefore, be wrong.
The argument above is most vulnerable to which of the following criticisms

A．It rejects an empirical claim about the average per capita incomes in the two countries without making any attempt to discredit that claim by offering additional economic evidence.

B．It treats the vague term "poverty" as thought it had a precise and universally accepted meaning.

C．It overlooks the possibility that the number of people in the two countries who live in poverty could be the same even though the percentages of the two populations that live in poverty differ markedly.

D．It fails to show that wealth and poverty have the same social significance in Kuptala as in Bahlton.

E．(E) It does not consider the possibility that incomes in Kuptala, unlike those in Bahlton, might all be very close to the country’s average per capita income.
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