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问题 填空题

钢琴中C调do的频率是261.6 HZ，钢琴中的发声体在5 s的时间里振动了______次．

答案

钢琴中C调do的频率是261.6 HZ，发声体1s振动了261.6次．发声体在5 s的时间里振动了1308次．

故答案为：1308．

单项选择题

XX公司向境外客户提供劳务之后，前往甲银行办理国际结算业务。该公司开出汇票请求甲银行为其办理收款业务。

该案列所采用的结算方式为()。

A.信汇

B.电汇

C.托收

D.信用证
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单项选择题

Even though current technologies make the ultimate segmented network impractical, new technologies and products hold the promise of making the concept a reality. Most important of all these new technologies are (66) . The ultimate switched LAN, which is technically possible, now, exhibits the following characteristics:

1. High-speed yet cost-effective switching devices can be implemented on a wide scale, providing dedicated connections for individual users and supporting the aggregate (67) of all networked users.

2. The ability to deploy switching capabilities incrementally into the (68) base. Switching implementations support switching of individual users or groups so that existing users of shared media modules can continue to use the existing equipment until they can justify moving to dedicate switched LAN connections.

3. Support and enhancement of existing routed environments. Switching (69) routint, but rather can be introduced into the network without making any changes to the existing routing equipment or configuration. (70) play a critical role in the integration of switching into existing networks.

（69）（）

A. switch-based LANs

B. WANs

C. user services

D. LAN-BY-PHONE
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