一片8259A占用几个I/O端口地址?如何选择不同的I/O端口地址?
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远动通道的双工方式可以在()。
A. 两个方向不同时传送;
B. 一个方向上传送不能反向传送;
C. 两个方向上同时传送;
D. 一个方向上传送可反向传送。
A fire must be ventilated().
A. when using an indirect attack on the fire such as flooding with water
B. to prevent the gases of combustion from surrounding the firefighters
C. to minimize heat buildup in adjacent compartments
D. if compressed gas cylinders are stowed in the compartment on fire