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【单选题】
—What colour are the oranges?. — __ . [ ]A.
They are oranges
B.
They are orange
C.
It’s orange
D.
It’s an orange
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举一反三
【单选题】The rail operators disagree with the current re-nationalization for the reason that______.
A.
the passengers and taxpayers have benefited from the franchising system
B.
the Labour itself introduced the franchising system with legal contracts
C.
the running expenses are hard to cover with the current re-nationalization
D.
there is more to do to improve enforced re-nationalization with less cost
【简答题】微分方程 的通解中应包含的任意常数的个数是______。
【简答题】微分方程的通解中应包含的任意常数的个数是______。