更多“菌落总数测定的操作，请解释哪些步骤比较关键？
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As a frame leaves a Layer 3 device，the Layer 2 encapsulation information is changed from what it was when it entered the device. For what two reasons can this happen？（）
A.The data is moving from 10BASE-TX to 100BASE-TX. B.The WAN encapsulation type has changed. C.The data format has changed from analog to digital. D.The source and destination hosts are in the same subnet. E.The source and destination MAC addresses have changed.
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氨气是极具活性的气体，它与臭氧和超氧化氢反应很快生成氮气。
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集体劳动争议是指有共同理由、劳动者一方当事人在()人以上的劳动争议。
A.5
B.8
C.10
D.15
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听力原文：M: Good morning, Ms. Smith. Welcome to today's show.W: Thank you.M: Today we're going to talk about the living of foreign students in our country. You know, for many international students, coming to the United States and living here and studying can be a quite frightening experience, especially when finding housing. Can you give them some advice?W: Sure. Fortunately, there are a variety of options that students can look to. They can choose to live on campus or off campus.M: Then can you say something about on-campus living?W: Well, I think first of all for first-time students, coming and (22)living on campus in dormitories can provide a certain level of security because of its closeness to campus facilities since commuting without a car can be quite an experience, especially when you have to commute long distances. Often in dormitories, meals might be provided, and this can allow students to devote time to their academies, rather than housekeeping.M: That sounds quite good. Is there anything students should pay attention to when living on campus?W: Yes, (23)students should be aware that they'll be required to abide by certain regulations dealing with student eonduct as part of the contract and living on campus.M: Then what about off-campus living?W: (24)Like living in dormitories, uh, living off campus in an apartment requires little or no maintenance specifically because usually it is handled by someone else. Also, when you live off campus, there might be a certain amount of flexibility in choosing roommates that you might not have when living on campus. (25)But you should be aware that tenants may be responsible for furnishing their own apartments.M: Well, thank you, Ms. Smith, for the information you have provided for us.W：My pleasure．(23)A．Meals are provided free of charge on campus.B．Students are more secure on campus.C．Students are free to choose their roommates.D．Students have more chances to make friends.
A.W:B.M:C.M:D.M:E.M:F.M:G.W：MyH.(23)A．MealsI.B．StudentsJ.C．StudentsK.D．Students
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7.甲公司本年度委托乙商店代销零配件一批,代销价款100万元。本年度收到乙商店交来的代销清单,代销清单列明已销售代销零配件的60%,甲公司收到代销清单时向乙商店开具增值税专用发票。乙商店按代销价款的5%收取手续费。该批零配件的实际成本为70万元。则甲公司本年度应确认的销售收入为( )万元。
A. 60 B. 70 C. 100 D. 57
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在热量单位换算中，1卡等于（ ）焦耳。
A.4.18B.3.18C.5.18
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根据《刑法》规定，下列选项中不属于单位犯罪主体特征的有（）。
A . 个人盗用单位名义实施犯罪，违法所得由实施犯罪的个人私分的，不属于单位犯罪
B . 单位一般成员实施的犯罪，不属于单位犯罪
C . 刑法分则特别规定可以由单位实施的犯罪，才能认定为单位犯罪
D . 犯罪主观方面可以是故意，也可以是过失
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在产品生命周期的第一个阶段，即新产品阶段，发达国家选择的生产和销售方式是：（）。
A.本国生产，本国销售
B.本国生产，国外销售
C.国外生产，国外销售
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对烤瓷合金的要求不正确的是
A．弹性模量小
B．湿润性好
C．收缩变形小
D．铸造性能好
E．不易变形和磨损
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传输层的PDU特定名称是（）
A.数据段
B.分组报文
C.数据帧
D.比特流
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机组运转后发电机无输出电压或很低的故障原因包括（）。
A.发电机铁芯剩磁消失或太弱 B.励磁回路接线错误 C.交流励磁机故障无输出电压 D.发电机空载或低载运行
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A . 变极调速B . 改变定子电压调速C . 改变转子回路电阻调速D . 变频调速
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大队、中队委员会委员和小队长都要佩戴（）标志。
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对客房部员工能力特征的描述不包括（）。
A.注意力集中
B.抽象思维的能力
C.记忆客情能力强
D.语言表达能力较强
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施工项目管理的内容主要包括（）。
A. 编制“项目管理规划大纲”和“项目管理实施规划”B. 项目进度控制，项目质量控制，项目安全控制，项目成本控制C. 项目人力资源管理，项目材料管理，项目机械设备管理，项目技术管理D. 项目利润保证
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