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【单选题】
--Have you found the information about famous people you can use for the report? --Not yet. I’ll search some online.A.
which
B.
who
C.
what
D.
whom
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【简答题】线圈一端的绝缘皮只刮去半周,则这半周线圈转动的原理是 ________________________ ;另外半周的绝缘皮没有刮掉,则这半周线圈是在 _________ 的作用下实现连续转动的。 简易线圈的这种结构相当于电动机的 __________ 。
【单选题】The Joneses (have visited) Hawaii and Alaska, and they (assure me) that (they) like Alaska (the best).
A.
have visited
B.
assure me
C.
they
D.
the best
【单选题】The Alaska Pipeline The Alaska pipeline starts at the frozen edge of the Arctic Ocean. It stretches southward across the largest and northernmost state in the United States, ending at a remote ice-fre...
A.
operating costs
B.
employees
C.
consumers
D.
construction
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【简答题】A．Because gold was found in Alaska. B．Because Alaska has an abundance of seafood. C．Because Alaska proved rich in oil and minerals. D．Because Alaska is bordered by Yukon.
【单选题】下列结论正确的是【 】
A.
是非齐次线性方程组 的解, 则 是对应 的解;
B.
是非齐次线性方程组 的解, 则 是对应 的解;
C.
如果向量组 是线性方程组 的一个基础解系, 则向量组 , 也是 的一个基础解系.
D.
6个未知数,7个方程的非齐次线性方程组 有解,且 2,则对应 的基础解系中含有4个解.
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