What does the phrase “clam up” in Paragraph 2 probably mean?A.become excited B.show

第1题

X线平均波长(λmean)与最短波长(λmean)的关系是A.λmean=3λminB.λmean=5λminC.λmean=2λminD.λmean=5λminE.λmean=λmin

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第2题

-Does "am"___ afternoon-No, it morning.A. means，meanB. means, meansC. mean, means

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第3题

They are all _________ at the _______ news.A、exciting; excitedB、excited; excitingC、 exciting; excitingD、excited; excited

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第4题

What ________ the notice________?A. is, sayB. is, saidC. did, sayD. does, say

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第5题

x线平均波长(λmean)与最短波长(λmin)的 关系是A.λmean =3λminB.λmean =2.5λminx线平均波长(λmean)与最短波长(λmin)的 关系是A.λmean =3λminB.λmean =2．5λminC.λmean =2λminD.λmean =l．5λminE.λmean=λmin

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第6题

已知Lxx=∑(x－mean(x))2=400,Lyy=∑(y－mean(y))2=3000,Lxy=∑(x－mean(x))·(y－mean(y))=－1000;则相关系数r=()。注:mean(x)、mean(y)分别为x,y的均值。A.0.925B.-0.913C.0.957D.0.913

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第7题

What _______ “Mr” mean?A. isB. doesC. Do

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