帧中继网的虚电路建立在 (1) ,在用户层面采用的协议是 (2) 。这种网络没有流量控制功能,但增加了拥塞控制功能。如果沿着帧传送方向出现了拥塞,则把帧地址字段中的 (3) 位设置为1,这样接收方就可通过 (4) 协议要求发送方降低数据速率。最适合提供帧中继业务的网络是 (5) 。
5()For this part, you are required to write a
composition on the topic Foods are overwhelmingly the most
advertised group of all consumer products in the United States. Food
products lead in expenditures for network and spot television advertisements,
discount coupons, trading stamps, contests, and other forms of premium
advertising. In other media- newspapers, magazines, newspaper supplements,
billboards, and radio- food advertising expenditures rank near the top. Food
manufacturers spend more on advertising than any other manufacturing group, and
the nation’s grocery stores rank first among all retailers. Throughout the 1970s, highly processed foods have accounted for the bulk of total advertising. Almost all coupons, electronic advertising, national printed media advertising, consumer premiums ( other than trading stamps) as well as most push p A. coupon redemption B. retail advertising C. advertising in trade journals D. direct selling [单项选择]构成传染过程必备的环节是()
A. 传染源、传播途径、易感人群 B. 病原体的数量、毒力和机体免疫力 C. 病原体、人体和病原体所处的环境 D. 病原体、社会因素、自然因素 E. 屏障作用、吞噬作用、体液作用 [单选题]用固定价格或不便价格来计算的GDP 是( )。
A.实际GDP B.名义GDP C.潜在GDP D.绿色GDP [单选题]氨基糖苷类抗生素的作用不包括
A.神经肌肉阻断作用 B.快速杀菌 C.二重感染 D.肾毒性 E.耳毒性 [判断题]不得随意拆除未采取补强措施的受力构件。
A.正确 B.错误 [单项选择]盘式制动器的制动盘应平整、无变形,磨损后的厚度不应小于()。
A. 2mm B. 3mm C. 4mm D. 5mm [判断题]判断"机密级国家秘密是指泄露会使国家的安全和利益遭受特别严重的损害的国家秘密事项。()
A.正确 B.错误 [单选题]单选题
(2018年真题)票据行为是指以发生、变更或消灭票据的权利义务关系为目的的法律行为,( )是汇票所独有的一种票据行为。 A.出票 B.承兑 C.保证 D.背书 [单项选择]以下关于自底向上开发方法特点的描述中,正确的是哪些
Ⅰ.该方法支持企业战略目标的制定
Ⅱ.该方法适合规模较大的信息系统的开发
Ⅲ.相对地说,每一阶段的规模较小,易于控制和掌握
Ⅳ.该方法适应组织机构的真正需要
Ⅴ.由于系统未进行全面规划,系统的数据一致性和完整性难于保持
A. Ⅰ,Ⅱ和Ⅲ B. Ⅱ,Ⅲ和Ⅳ C. Ⅲ,Ⅳ和Ⅴ D. Ⅱ,Ⅳ和Ⅴ 我来回答: 提交
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