显示器属于表现媒体，而鼠标却不属于表现媒体。
The damage to a vessel is over $25，000. Who must notify the nearest Coast Guard Marine Safety or Marine Inspection Office as soon as possible? （） ["The owner of the vessel","The Master of the vessel","The person in charge of the vessel at the time of casualty","Any one of the above"]
什么是定额水平？
Under rotary pumps are the gear, （）, cam-and-piston and screw types. ["reciprocating","diffuser","turbine","vane"]
多媒体技术中的“媒体”是指磁盘、磁带、光盘、半导体存储器等。
更换模具零件的基本原则是什么？
