8253的各个通道都为16位计数器，若要求计数值为最大，必须输入的计数初值为（）

对8253，若CLK端输入脉冲的频率一定，则计数初值为（）时，定时时间最长。

8253定时器的六种工作方式中，有自动重置初值功能的工作方式是（）

8253在工作方式设定时总是先写计数初值再写控制字。

Every deliberate act of wrongdoing by the master or any of the crew against the ship or cargo，without the authorization or privity of the Shipowner or his agent，is（）.

（）, or drum is used for hauling in or letting out the wires or ropes which will fasten the ship to the shore.

A salvor may be（）the whole or part of the payment due under Salvage Convention to the extent that the salvage operations have become necessary or more difficult because of fault or neglect on his part or if the salvor has been guilty of fraud or other dishonest conduct.

The （） is used for hauling in or letting out the wires or ropes.

Vessels must be（）valid certificate of nationality or certificated of registry or license.

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

在某微机系统中，8253的3个计数器的端口地址分别为60H,61H和62H，控制字寄存器的端口地址为63H，要求8253的通道0工作方式于方式3，并已知对它写入的计数初值n=1234H，编写为初始化程序。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。