问题
单项选择题 B1型题
一个工作日内，任何一次接触不得超过的15分钟时间加权平均的容许接触水平是指（）
A.生物学接触限值
B.时间加权平均容许浓度
C.最高容许浓度
D.阈限值
E.短时间接触容许浓度
答案
参考答案：E
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一个工作日内，任何一次接触不得超过的15分钟时间加权平均的容许接触水平是指（）
A.生物学接触限值
B.时间加权平均容许浓度
C.最高容许浓度
D.阈限值
E.短时间接触容许浓度
参考答案：E
Angela at the age of 11years old was badly ill and she was attacked by a rare disease influencing her nerve system(神经系统). She was unable to and her movement was limited (限制) in other ways as well．The doctors did not hold much of her recovering from this illness. They said she would the rest of her life in a wheelchair. They also said that few were able to come back to their level after suffering from this disease. However, the little girl was . There, lying in her hospital bed, she that she was going to be walking again someday. Angela was moved to a(an) hospital in San Francisco, where she could get better after the illness．All the treatments(治疗)that could be used to her disease were . The doctors praised her, she never once thought of giving up. They taught her about seeing herself walking. If it would do else, it would at least give her hope and something optimistic(乐观的)in the long waking hours in her bed. Angela worked as hard as possible in physical treatment，and in exercise periods. Also she worked hard when she lay there, herself moving，moving, moving! One day， she was trying，with all her determination, to imagine her legs moving again，it seemed as though something happened: the bed moved! it began to move around the room! She out, “Look what I'm doing! Look! Look! I can do it! I moved! I moved!” Of course，at this very moment everyone else in the hospital was crying aloud and running for .Everything started to .People felt that the floor moved back and forth a bit like being on a boat on gentle waves(浪)．You see，it was the San Francisco earthquake．Angela didn’t know that．Instead，she felt that she did it. And now only a few years later, she’s back in school, on her own . No wheelchair, no sticks to help her. You see, anyone who can shake the earth can a little disease, can’t they?
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