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[单选] 电源转换器必须选用具备3C认证的产品。
A．对 B．错
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随机题目

管理控制是按照国家法律和标准以及企业规定建立起来的管理程序和措施，是预防化学品危害的一个重要方面。（）
局部通风是用新鲜空气将作业场所中的污染物稀释到安全浓度以下，所需风量大，能净化回收。（）
采取改变工艺，隔离危险源，实施有效的通风往往成为最直接、最有效的预防化学危害的手段。（）
C A taxi hit a truck． A policeman spoke to the taxi driver and to the truck driver． He also spoke to Tom． He was a witness （目击者）． This is what they said． TRUCK DRIVER: I was driving from the airport to Newton． A car crossed the road， so I slowed down． I did not stop． A taxi hit the back of my truck． Nobody was seriously hurt but both cars were damaged（受损害）． TAXI DRIVER: I was driving behind a truck a few kilometers from Newton． The truck stopped suddenly． The driver did not give me a warning （警告）． I was driving very slowly． I could not pass the truck because there were two cars coming near from Newton． My taxi hit the truck， and some glass cut my left hand． TOM: I was watching the traffic about a kilometer from the airport． A truck was going to Newton． It was not going very quickly． There was a taxi about two hundred meters behind the truck． It was going fast． When the truck slowed down， the taxi hit it． The taxi driver was not looking at the truck． He was looking out of the window at something． My friend saw the accident， too． Tom"s friend spoke to the policeman and agreed with Tom．11． How many people are mentioned （提到） in the story？
洗手的五个指征？
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