SMB network decision makers commonly site which of the following as typical network requirements?()
A. scalability, effectiveness, high availability, mobility
B. cost effectiveness, high availability, hosting multiple protocols, hosting webservers
C. QoS, multicast, cost effectiveness, redundancy
D. centralization, security, highly available, scalability
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进口押汇的期限自对外付汇日起至押汇归还日止,按实际天数计,最长期限不得超过()。
A. 80天
B. 90天
C. 100天
D. 120天
在双泵双溢流阀的等压系统中,为了防止共振和噪声,两阀应调成不同压力,即相差()。
A. 1MPa
B. 2MPa
C. 3MPa
甲乙两种业余无线电台设备资料列出接收机灵敏度指标分别为0.1μV和0.15μV。其推论为什么?