第4题: [单项选择]{{B}}Passage One
Questions 26 to 29 are based on the passage you have just heard.{{/B}} A. A bag of money. B. An envelope. C. A cheque. D. Both A and B. 参考答案:A 答案解析:[听力原文]
What did the young man find under the stone
第24题: [单项选择]超声波清洗机操作使用中应注意连续清洗一般不应超过()。 A. 10min B. 8min C. 6min D. 5min E. 2min 参考答案:C 答案解析:1.超声波清洗机连续清洗时间不应超过6min。
2.时间到后,清洗机自动停机。应停机一段时间后才能再次启动清洗机,以便换能器有足够时间降温。