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[问答题] 试述注意的功能?

SONET Path Terminating Equipment (PTE) requires which three line codes to be supported for DS1 and DS3 circuits?() (Choose three.) ["AMI","ESF","DUS","SSM","B3ZS","B8ZS"] CAD K-means算法叙述正确的是() ["在K-means算法中K是事先给定的,这个K值的选定是非常难以估计的","在K-means算法中,首先需要根据初始聚类中心来确定一个初始划分,然后对初始划分进行优化","对于一个类中的每个对象,在其给定半径的领域中包含的对象不能少于某一给定的最小数目","从K-means算法框架可以看出,该算法需要不断地进行样本分类调整,不断地计算调整后的新的聚类中心,因此当数据量非常大时,算法的时间开销是非常大的"] 依企业所得税法规定,关于境外所得汇总纳税时可抵扣,下列说法正确的是() ["采取限额抵扣制","实行分国计算抵免限额","当年抵免不足的,可在以后年度补扣","按在国外实际缴纳金额抵免"] You have configured the following:  RMAN> CONFIGURE DEFAULT DEVICE TYPE TO ’sbt’; new RMAN configuration parameters:  CONFIGURE DEFAULT DEVICE TYPE TO ’sbt’; new RMAN configuration parameters are successfully stored RMAN> SHOW DEVICE TYPE; RMAN configuration parameters are: CONFIGURE DEVICE TYPE SBT PARALLELISM 1; # CONFIGURE DEVICE TYPE DISK PARALLELISM 1; #  RMAN> CONFIGURE DEVICE TYPE SET PARALLELISM 5;  RMAN> SHOW DEVICE TYPE; RMAN configuration parameters are: CONFIGURE DEVICE TYPE SBT PARALLELISM 5; CONFIGURE DEVICE TYPE DISK PARALLELISM 1; #  How many channels are allocated to SBT?() ["0, because channels have not been defined.","3, as indicated by the degree of parallelism.","1, the default value when device is configured.","5, as indicated by the last parallelism command."] 试述注意的功能?
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