During my visit to China, I stayed in several hot
els. I would like to say something about fire regulations(条例) in these hotels.
When I was in Beijing in a hotel, I checked the nearest fire escape to my room, as I usually do, I found that the exit(出口) out of the buildings was on the ground floor, chained and locked! If there was a fire, people wouldn’t be able to escape. In some other places, I did not find any notice about the procedures.
In most hotels in my country, there is a notice on the back of the door of every guestroom. In Japan the porter（门卫）actually points out the escape route when bringing your bag to your room. I hope Chinese hotels will improve their safety procedures.
57. The foreigner suggests that ____________.
A. all the exits should
not be always chained and locked
B. all the exits should be always chained and locked
C. fire regulations（规程，规章）should be paid enough attention to in some hotels in China
D. the fire regulations should not be strict
58. Nobody would get away if there were a fire in the building ____________.
A. if the porter doesn’t tell people the escape route
B. with the exit chained and locked
C. before people found the notice about safety procedures
D. when too many people try to escape at the same time
59. The nearest escape to the writer’s room in a hotel in Beijing was _____________.
A. nowhere to be found B. not far from his room
C. next to his room D. on the ground floor
60. In Japan a guest is told how to get away in time of fire when he ____________.
A. arrives at a hotel B. is traveling in the country
C. reaches the country D. says hello a porter
H＋＋A－，则K＝
式中：K为电离平衡常数，只与温度有关，c为各粒子的平衡浓度．下表是几种常见弱酸的电离平衡常数(25℃). 