[单选] （）是因素分析法的一种简化形式，它利用各个因素的目标值与实际值的差额来计算其对成本的影响程度。

国家加大对种业发展的支持。以下哪个方面属于支持范围。（） 品种选育、生产、示范推广。 种质资源保护。 种子储备。 制种大县。 The Peanut router is able to successfully ping the Serial 0 and Ethernet 0 interface of the Popcorn router, but a ping issued to the Ethernet 1 interface fails. Based on the above output, what are the potential causes of this problem?（） The Popcorn router is not forwarding RIP updates.。 The Popcorn router did not include network 192.168.12.0 in its routing configuration.。 The Ethernet1 interface of the Popcorn router is shutdown.。 The clockrate is not present in the configuration of one of the routers.。 The Serial interface of the Popcorn router is not operating.。 身心平行论 一项发盘，经过还盘后，则该项发盘（）。 失效。 仍然有效。 对原发盘人有约束力。 对还盘人有约束力。 Routers R1 and R2 are EIGRP neighbors. R1 has been configured with the eigrp stub connected command. Which of the following is true as a result？（） R1 can learn EIGRP routes from R2, but R2 cannot learn EIGRP routes from R1。 R1 can send IP packets to R2, but R2 cannot send IP packets to R1。 R2 no longer learns EIGRP routes from R1 for routes not connected to R1。 R1 no longer replies to R2's Query messages。 R2n o longer sends to R1 Query message。 （）是因素分析法的一种简化形式，它利用各个因素的目标值与实际值的差额来计算其对成本的影响程度。