【单选题】操作系统文件管理的主要功能是( D )。
【多选题】无人机可按飞行平台构型、用途、尺度、 、 、 、使用次数等方法进行分类。
【简答题】操作系统文件管理的主要功能是 _____
【单选题】Tim is limited .He ’ d better take a taxi to go to work,_______ he?
【单选题】He’d better go at once, ______?
【单选题】He ’ s got a bad toothache.He ’ d better go to _____.
【单选题】----I _____this morning, but he could not come. ----Well, we’d better go and _____at his office.
A.
called him; call on him
B.
called on him; call him
D.
called him; call at him