题目内容
(请给出正确答案)
[单选题]
With the villager ______ the way, we had no trouble ______ the cottage()
A.to lead; finding
B.to lead; to find
C.leading; to find
D.leading; finding
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A.to lead; finding
B.to lead; to find
C.leading; to find
D.leading; finding
第1题
A.did the villagers realize
B.the villager srealize
C.the villagers did realize
D.didn't the villager srealize
第3题
A.工程索引数据库(Engineering Villager)
B.万方资源数据库
C.WOS(Web of science)检索平台
D.维普期刊数据库
E.SciFinder检索平台
第5题
设f(t)=f1(t)i+f2(t)j+f3(t)k,g(t)=g1(t)i+g2(t)j+g3(t)k,
,,
证明:
.
第9题
A.y(t)=(e-t+e-2t)ε(t)
B.y(t)=(e-t)ε(t)
C.y(t)=(e-t–e-2t)ε(t)
D.y(t)=(–e-2t)ε(t)
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