成品酱油的配制
Which of these correctly identifies a difference between the way BPDUs are handled by 802.1w and 802.1D？ （） [" 802.1D bridges do not relay BPDUs."," 802.1w bridges do not relay BPDUs."," 802.1D bridges only relay BPDUs received from the root."," 802.1w bridges only relay BPDUs received from the root."]
重介质选煤的基本原理是（），即浸没在重介质中的颗粒受到的浮力等于颗粒所排开的同体积的介质重量。 ["牛顿定律","阿基米德原理","勾股定律","二八定律"]
部门之间应本着（）的原则必须相互支持。 ["有福同享","有难同当","一致对外","团结协作"]
列车经过隧道未开启照明灯，属于（）问题。 ["红线","A1","A2","B"]
游车
