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听力原文: A researcher at the University of Rochester in New York has found that workers exposed to high levels of lead on the job have an increased risk of dying from brain cancer. Epidemiologist Edwin Van Wijngaarden looked at data about more than 300,000 people over a nine-year period, comparing the kinds of jobs they had with their causes of death, and he saw a correlation. Mechanics are among the workers more likely to develop deadly brain tumors due to occupational lead exposure. He says, automobile and heavy equipment mechanics, painters and welders—who were more likely to be exposed to lead for longer periods of time—had even higher risks of developing brain cancer than workers unexposed to lead. Most research on lead has focused on its effect on children. Van Wijngaarden says not much is known about its impact over a lifetime. Wijngaarden found only 119 brain tumor deaths. He is continuing his research, looking now at patients who already have brain tumors, to see whether they have higher levels of lead in their bones than other patients. Who are NOT mentioned as people more likely to he exposed to lead?
A.
Automobile mechanics.
B.
Painters.
C.
Waiters.
D.
Heavy equipment mechanics.
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【单选题】平车护送骨折病人入手术室,护士应注意
A.
为了争取抢救时间,应以最快的速度推平车
B.
为了便于搬运,可暂时停止吸氧,等安置好后再续吸氧
C.
为了便于搬运,可暂时停止输液,等安置好后再续输液
D.
搬运时应在平车上垫一木板,并固定好骨折部位
E.
为了争分夺秒,可用平车直接撞开手术室门
【判断题】耳朵感受到的声音强度与声源本身的声音强度呈正比关系。()
A.
正确
B.
错误
【单选题】某酸溶液中C(H + )=0.1mol?L -1 ,则该酸溶液的物质的量浓度为(   )
A.
一定等于0.1mol?L -1
B.
一定大于0.1mol?L -1
C.
一定小于0.1mol?L -1
D.
无法确定
【单选题】细菌性肝脓肿最常见的早期症状是
A.
肝区疼痛
B.
肝大
C.
寒战和高热
D.
恶心呕吐
E.
黄疸
【单选题】照明电路中, 不会造成触电事故的是( )
A.
人站在地上, 一只手接触火线
B.
人站在地上, 二只手接触火线
C.
人站在地上, 一只手接触零线
D.
人站在绝缘凳上, 一只手接触火线, 一只手接触零线
【单选题】1mol/L 溶液中 的浓度是
A.
0.1mol/L
B.
0.2mol/L
C.
0.3mol/L
D.
0.4mol/L
E.
0.6mol/L
【判断题】洛伐他汀和辛伐他汀均为前体药物,需在肝脏内将内酯打开才转化成活性物质。
A.
正确
B.
错误
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【简答题】v.阐明,明确,界定
【单选题】将0.1mol/L 和0.2mol/L 等体积混合后,Cl 离子浓度为( )
A.
0.5mol/L
B.
0.4mol/L
C.
0.3mol/L
D.
0.1mol/L
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