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【单选题】
大肠菌群平板的适宜范围是A.
30-300
B.
15-150
C.
10-150
D.
25-250
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【简答题】Once Dr. Mellinkoff invited me to join him at the hospital to discuss interesting cases（案例， 病例） with his students．The case at hand was a Guatemalan man, aged 34, who had a fever and many other medica...
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【单选题】当 SW1 和SW2都处于接通状态时,灯泡的电流:( )
A.
大于只有SW1或SW2接通的状态
B.
小于只有SW1或 SW2接通状态
C.
等于只有SW1或 SW2接通状态
D.
接通断开没影响
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