[多选] A national retail chain needs to design an IP addressing scheme to support a nationwide network. The company needs a minimum of 300 sub-networks and a maximum of 50 host addresses per subnet. Working with only one Class B address, which of the following subnet masks will support an appropriate addressing scheme?（）

碎屑岩基本组分：碎屑颗粒、填隙物（）、孔隙。 在PTN单板中，以下哪个单板上的接口只能用在用户（） CD1单板上的通道化STM-1口。 AD1上的ATMSTM-1口。 D12/D75上的E1口。 POD41上的POSSTM-1/STM-4。 小学生自觉纪律的形成要经历从外部要求转化为内部需要的过程。一般经历以下几个阶段：（） 依靠外部教育要求阶段。 服从阶段。 过渡阶段。 把纪律原则变成自觉行动的阶段。 内化阶段。 金融投资 Based on the following output in a router A running LDP， which statement is true？（） None of the above.。 The IP address 50.0.0.1/32 is assigned to the non-directly connected LDP neighbor， 50.0.0.4.。 The IP address 50.0.0.1/32 is assigned to one of its own interfaces.。 The IP address 50.0.0.1/32 is assigned to its directly connected LDP neighbor， 50.0.0.4.。 A national retail chain needs to design an IP addressing scheme to support a nationwide network. The company needs a minimum of 300 sub-networks and a maximum of 50 host addresses per subnet. Working with only one Class B address, which of the following subnet masks will support an appropriate addressing scheme?（）