第4题: [单项选择]Although customers keep complaining about their Poor service, they've made no ______. to make any improvement. 参考答案:C 答案解析:[题意]尽管顾客一直抱怨他们的服务质量差,但他们仍不努力做任何提高。 [解析] 选项[C]和[D]都可以与make连用,但只有[C]符合题意,make no attempt to do st
第25题: [单项选择]补体结合试验中对人血清灭活的温度和时间是 A. 56℃,60min B. 56℃,30min C. 60℃,30min D. 57℃,30min E. 56℃,15min 参考答案:B 答案解析:CFT即补体结合试验,试验前需对人血清标本中的补体灭活。56℃,30min可使血清中绝大部分补体成分丧失活性。