问题
单项选择题
层流洁净病房细菌菌落总数卫生学标准是（）。
A．≤5个/m3
B．≤10个/m3
C．≤200个/m3
D．≤400个/m3
E．≤500个/m3
答案
参考答案：B
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层流洁净病房细菌菌落总数卫生学标准是（）。
A．≤5个/m3
B．≤10个/m3
C．≤200个/m3
D．≤400个/m3
E．≤500个/m3
参考答案：B
阅读下面短文，从短文后各题所给的四个选项（A、B、C和D）中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。 After graduation from a medical school, I began to take a job in a small hospital's emergency department．As the 36 member of the group, I had to work on Christmas Eve． At 9 pm, the ambulance 37 a man in his 60s who was having a heart attack．My patient was 38 , but I did my best．Eventually he 39 the night． The following year, still the newest member, I got Christmas Eve 40 again．At 9 pm sharp, I was told there was a 41 in the hall who wanted to speak with me． When I approached them, the man 42 himself as Levin and said, "you probably don't ' 43 me, but last Christmas Eve you saved my life．Thank you for the year you gave me．"He and his wife hugged me and handed me a small 44 and left, I was more than a little surprised and 45 ． The followin  g year a new doctor joined the group 46 I volunteered for the shift because I wanted to see if the Levins would 47 ．I 48 the door．Once again, at 49 9 pm, the Levins appeared．We 50 and Levin said he'd come to see me every Christmas Eve, and that 51 he didn't come, I would know it just wasn't his year． The last year I saw him, he brought me a crystal bell engraved （雕刻） with a single word: Friendship．Levin 52 the next year．Now, my family, friends and I 53 that bell every Christmas Eve at exactly 9 pm and 54 to the man who didn't forget to bring me good 55 ．
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