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【单选题】
载重60t及其以上的货车转向架采用的滚动轴承车轴为（）。A.
RB2
B.
C
C.
RD2
D.
RE2
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【单选题】We could not reason out the way the robbers escaped，because we were unable to find any ________ of them.
A.
chance
B.
trace
C.
point
D.
signal
【简答题】Its operating profit margins, (ysts point out) (a), are only around (half of that) (b) achieved in the industrial activities of General Electric, (the US company that) (c) is a long-time rival to ...
【单选题】The US achieved its predominance after World WarⅡbecause it had made____ efforts towards this goal.
A.
pain
B.
painstaking
C.
painful
D.
painstakingly
【单选题】The US achieved its predominance after World War II because it had made ____ efforts towards this goal.
A.
pain
B.
painful
C.
painstaking
D.
painstakingly
【单选题】( America and Americans were prosperous beyond the dreams of the Europeans and Asians whose economies the war had destroyed . ) The US achieved its predominance after World War II because ______.
A.
it had made painstaking efforts towards this goal
B.
its domestic market was eight times larger than before
C.
the war had destroyed the economies of most potential competitors
D.
the unparalleled size of its workforce had given an impetus to its economy
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