为防止系统故障造成系统内文件受损，常采用(54)方法来保护文件，设计实时操作系统时，必须首先考虑系统的(55)。

Electronic mail and filing permit a user to compose and transmit a message on an office(71)system. In the early 1970s, the ARPANET community developed a number of such systems which have been heavily used. Through standard message format(72), several hundred different computers and electronic mail interfaces are specification of how(73)and return addresses should appear on envelopes and which sizes are allowable for envelopes. In the electronic message world, they describe what(74)of characters are required at the(75)of a message to identify the sending and receiving mailboxes.A．robotizationB．automationC．dynamicD．action

A.
A．robotization
B．automation
C．dynamic
D．action

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人体必须需的营养有（）

A.糖类、蛋白质
B.脂肪、维生素
C.氮、磷等矿物质
D.无机盐、水

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