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【单选题】
现行GB4789.2规定用于检验食品中菌落总数的平板计数培养基pH值为（）A.
6.5 ±0.2
B.
7.0±0.2
C.
7.5±0.2
D.
8.0±0.2
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【单选题】下列关于布线的线缆选用的说法正确的是 ( )
A.
语音信道在水平子系统中一般采用五类大对数双绞线
B.
数据通信信道在水平子系统中一般采用超五类或六类双绞线
C.
在室内宜采用高带宽的单模光纤
D.
水平布线系统多采用 25 对大对数双绞线
【简答题】Hello, this is David Austin with the BBC news. —1—is beginning a 2-day meeting in Geneva aimed at —2—the global response to —3—. From Geneva, here's Imogen Foulkes. There's a lot the health experts do...
【单选题】听力原文：The idea of permanent education is practical because people are never really too old to go on learning．Of course there are certain limits but these are not age limits. Permanent education is prac...
A.
there are no limits at all.
B.
there are no age limits.
C.
no one is getting really too old.
D.
no one wants to learn at old age.
【简答题】水平子系统也称__,这个系统若使用双绞线,一般要求在__范围内,如果超过90m,应使用__布线。
【简答题】No one really wants to think about it, but we all need to learn how to 1 our finances. It can be difficult to 2 , and yet it is an essential skill for 3 the pressures of hood. However much we wou...
【单选题】下列关于布线的线缆选用的说法正确的是( )。
A.
语音信道在水平子系统中般采用五类大对数双绞线。
B.
数据通信信道在水平子系统中一般采用超五类或六类双绞线。
C.
在室内宜采用高带宽的单模光纤
D.
水平布线系统多采用25对大对数双绞线
【简答题】Why I Refused to Buy My Child a Mobile Phone 1 Every five minutes my children ask me for the “latest thing”. They tell me that all their friends have it already and they can’t live without it. Our hou...
【简答题】Anna I must go shopping 1 . But I really have no time. Stella What do you need to buy? Anna It is my daughter’s birthday next week and she wants a new bicycle. Stella Why don’t you look 2 ? You can fi...
【多选题】虽然在经济型订单批量模型中,我们假设订货至交货周期为零,但实际上,很多时候这个周期不会零,因为:
A.
进行订单准备工作需要时间
B.
把订单准确送抵供应商的相关部门需要时间
C.
供应商需要一定的准备时间
D.
供应商把货物运抵目的地需要时间
E.
对运抵货物进行处理需要时间
【单选题】No one wants you to be _______ but we really want you to do your best always.
A.
proud
B.
perfect
C.
polite
D.
popular
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