某逻辑门的输入端 A 、 B 和输出端 F 的波形图 1-7 所示, F 与 A 、 B 的逻辑关系是:
Goods are carried by several of transport--on road or rail, by sea or air.
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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