材料：英国社会比较开放，善于吸收别国的先进技术；英国实行比较宽容的宗教政策，使非

如图所示，A、B两轮间距为L=3.25m，套有传送带，传送带与水平方向成α=30°角，传送带始终以2m/s的速率运动．将一物体轻放在A轮处的传送带上，物体与传送带间的滑动摩擦系数为μ=

3

/5，g取10m/s²．则：

（1）物体从A运动到B所需的时间为多少？

（2）若物体与传送带间的滑动摩擦系数为μ=

3

2

，物体从A运动到B所需的时间为多少？

全面评估

下列关于债券利率风险的说法，不正确的是( )。

A．也叫价格风险
B．当市场利率上涨时，债券的市场交易价格上涨
C．对于在到期日前转让债券的投资者来说，利率上涨会减少投资人的资产收益
D．债券的到期时间越长，利率风险越大

In 1957 a doctor in Singapore noticed that hospitals were treating an unusual number of influenza-like cases. Influenza is sometimes called "flu" or a "bad cold". He took samples from the throats of patients in his hospital and was able to find the virus of this influenza. There are three main types of the influenza virus. The most important of these are type A and B, each of them having several subgroups. With the instruments at the hospital, the doctor recognized that the outbreak was due to a virus in group A, but he did not know the subgroup. Then he reported the outbreak to the World Health Organization in Geneva. WHO published the important news alongside reports of a similar outbreak in Hong Kong, where about 15-20 percent of the population had become ill. As soon as the London doctors received the package of throat samples, doctors began the standard tests. They found that by reproducing itself with very high speed, the virus had grown more than a million times within two days. Continuing their careful tests, the doctors checked the effect of drugs against all the known subgroups of virus type A. None of them have any protection. This, then, was something new, a new influenza virus, against which the people of the world had no help whatever. Having found the virus they were working with, the two doctors now dropped it into the noses of some specially selected animals, which get influenza much as human beings do. In a short time the usual signs of the disease appeared. These experiments proved that the new virus was easy to catch, but that it was not a killer. Scientists, like the general public, call it simply Asian flu. The first discovery of the virus, however, was made in China before the disease had appeared in other countries. Various reports showed that the influenza outbreak started in China, probably in February 1957. By the middle March it had spread all over China. The virus was found by Chinese doctors early in March. But China is not a member of the WHO and therefore does not report outbreaks of disease to it. Not until two months later, when travelers carded the virus into Hong Kong, from where it spread to Singapore, did the news of the outbreak reach the rest of the world. By this time it was well on its way around the world.

Without counting the subgroups, there are ______type (s) of influenza.

A．one

B．two

C．three

D．four

设立会计师事务所时，可以向下列哪个机构申请？（）

A、国务院财政部门

B、自治区、直辖市人民政府财政部门

C、市级人民政府财政部门

D、省级人民政府财政部门