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【多选题】
WDM系统的优势包括:
A.
充分利用光纤的巨大带宽资源,降低了长途传输的成本。
B.
数据格式透明。
C.
在网络扩充和发展中,WDM是理想的扩容手段。
D.
运用的复用技术。
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举一反三
【单选题】The essence of cell differentiation is:
A.
Determination
B.
Stability
C.
Transdifferentiation
D.
specific gene expression
E.
House-keeping gene expression
【单选题】The effect of product differentiation is to:
A.
start a price war.
B.
reduce prices to the noncooperative level.
C.
reduce the intensity of competition among the firms in the oligopoly.
D.
increase the intensity of competition among the firms in the oligopoly.
【判断题】Delayed differentiation is a means of increasing product variety without building the customized product from scratch or keeping large inventories of custom products.
A.
正确
B.
错误
【单选题】Cell differentiation is a process in which a generic cell develops into a specific type of cell in response to specific triggers from the body or the cell itself. This is the process which allows a si...
A.
millions
B.
thousands
C.
dozens
D.
hundreds
【判断题】Differentiation is a strategy useful at the business level.
A.
正确
B.
错误
【简答题】Differentiation is important in a tagline, which means including a characteristic that distinguish the brand from ______.
【单选题】下列关于计算机网络的叙述中正确的是 ________。
A.
网络中所有计算机运行的操作系统必须相同
B.
一些智能设备(如手机、 ATM柜员机等)也可以接入计算机网络
C.
计算机组网的目的主要是为了提高单机的运行效率
D.
构成网络的多台计算机其硬件配置必须相同
【判断题】Product differentiation is common in a market characterized by monopolistic competition.
A.
正确
B.
错误
【多选题】上海已成为 水质 型缺水城市。为解决上海水资源问题,目前可以采取的措施有
A.
海水淡化
B.
将取水口从黄浦江移至长江
C.
大力开采地下水
D.
防治水体污染,改善长江、太湖来水的水质
E.
节约用水,减少浪费
【简答题】读各大洲的降水、蒸发及径流量的对比图,回答:(10分) (1) 衡量水资源丰歉的标准 , 其数值等于 量与 量之差。 (2)世界各大洲中江河径流总量最多的是 、其次是 最少的是 。 (3)上海所处的地理纬度虽然与许多缺水国家相近,但以水资源数量而言,上海并不缺水,这主要是由于上海地区受 环流的影响.然而上海现在却已成为水质型缺水城市。解决上海的水资源问题,现阶段可采取的措施有(多项选择) A.大力...
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