在PowerPoint 2000放映视图方式下，幻灯片中的对象不能修改。()
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在Windows98“资源管理器”窗口中，按住ctrl键， 用鼠标右键可一次选定多个分散的文件或文件夹。()
In a traffic separation scheme, when joining a traffic lane from the side, a vessel shall
A. only in case of an emergency or to engage in fishing within the zone
B. as nearly as practical at right angles to the general direction of traffic flow
C. at as small an angle as possible
D. only to anchor within the zone
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