电动机常用的电力制动方法有变频制动、反接制动和能耗制动。
A. 正确
B. 错误
Which of the following options applies to virtual Ethernet devices（）
A virtual Ethernet adapter can only connect to other partitions within the same system.
B. A virtual Ethernet adapter needs to be connected to an external VLAN capable switch to be able to communicate with other partitions on the same system.
C. A partition can support an unlimited number of virtual Ethernet devices.
D. A virtual Ethernet adapter in the VIO Server that is part of a SEA should not have the "trunk flag" set
小型异步电动机的电容－电磁制动的过程分成两端，开始为电容制动，然后把电动机三相绕组短路进行电磁制动。
A. 正确
B. 错误
某企业外购材料一批，已验收入库，贷款已付。下列各项中，属于这项经济业务应填制的会计凭证的有（）。
A. 收款凭证
B. 收料单
C. 付款凭证
D. 累计凭证
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