【单选题】Not until the press reported the pollution _________ why the water supply had been cut off.
【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。
【单选题】None of the five people killed by inhalational anthrax had been vaccinated against influenza
【单选题】下列VPN技术中,属于第二层VPN的有()
【多选题】下列VPN技术中,属于第二层的VPN的有
【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、()。