往复泵管路阻率越小泵功率消耗()。
参考答案:越小
—What do you plan to do for the homeless people?
—I want to ______ some clothes ______ them. [ ]
A. provide; with
B. provide; for
C. give; with
D. buy; to
1937年12月,日军进攻南京,国民政府迁都到 [ ]
A.西安
B.太原
C.重庆
D.成都