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【多选题】
计算机网络按网络拓扑结构可分为( )。A.
星型网络
B.
环形网络
C.
网络
D.
总线型网络
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举一反三
【单选题】Not until the press reported the pollution _________ why the water supply had been cut off.
A.
people did know
B.
people had known
C.
did people know
D.
had people known
【多选题】Mark Twain had led an active life in the very center of the American experience. He had been a____________ .
A.
printer, pilot, soldier
B.
silver-minor, gold-washer
C.
lecturer, traveler, businessman
D.
novelist, autobiographer
【简答题】链传动的类型为传动链传动、（）、牵引链传动。
【简答题】链传动的类型为（）链传动、（）链传动、（）链传动。
【单选题】Fewer people would have died if______.
A.
more announcements had been made
B.
people hadn't used the lifts
C.
the people had obeyed the office
D.
the incident had happened on a weekend
【简答题】链传动的类型为传动链传动、起重链传动、（）。
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