更多“通讯运用较早较多的一种表现形式是（）。”相关的问题
液态非理想混合物中，组分B的活度系数表示式中，下列正确的是：（）。
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( )是委托人向拍卖人提起拍卖的最初阶段。
A、拍卖委托
B、拍卖公告
C、拍卖展示
D、拍卖交割
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听力原文： When you have a dog it is necessary to care for it carefully. In return you will be loved by your dog. The most important part of dog-care is to keep the dog clean. Not only does the dog have to be kept clean, his environment should also be clean. The bed he sleeps in can be made with anything like a rug or a dog mattress. Proper feeding is also important. A dog should be fed in the same place and on a regular schedule. During feeding time it should be quiet, ff your dog refuses to eat, don't force him. Remove his food and don't feed him again until his next feeding. Food should never be left before a dog for over thirty minutes under any circumstances, If he does not eat over a long period of time, your dog should be taken to a vet. Another important thing is to keep fresh water available to the dog during hot weather. One important thing is exercise for dogs. Vigorous exercise helps to build strength and keeps dogs healthy. A regular walk at a fixed time of the day is enough for smaller dogs. Large dogs, though, require a run in an open field.How long should food be left before a dog?A．As long as possible,B．At least 30 minutes.C．All day.D．No more than 30 minutes.
A.B.C.D.E.HowF.AsG.AtH.C．AllI.D．No
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三级动火前，由施工单位开展作业前安全分析，填写“（）”，经基层单位安全和技术人员组织审查后，报基层单位主管领导审定，主要领导审批并指派相关监督管理人员到现场监督实施。
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原子吸收光谱由下列哪种粒子产生的（）
A.固态物质中原子的外层电子
B.气态物质中基态原子的外层电子
C.气态物质中激发态原子的外层电子
D.气态物质中基态原子的内层电子
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禁毒知识题库：社区戒毒的期限为（）年，自报到之日起计算。
A．5
B．3
C．2
D．1
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餐饮企业贮存区应满足（）要求。
A . A.发料迅速
B . B.减少劳动强度
C . C.减少工作量
D . D.有利于安全管理
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工业企业购入存货的实际成本不包括( )。
A. 买价B. 运输费C. 运输途中的合理损耗D. 采购入员的差旅费
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公共娱乐场所安全出口的疏散门应
A. 双向开启 B. 向外开启 C. 向内开启
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6.设
0\leqslant a_{n}\leqslant b_{n}(n\in N_{+}) ，则级数
\sum\limits _{n=1}^{\infty }b_{n} 发散是级数
\sum\limits _{n=1}^{\infty }a_{n} 发散的（ ）。A.充要条件B.充分条件C.必要条件D.无关条件
按供暖系统使用热媒不同可分为 ( ) 供暖系统和蒸汽供暖系统。
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