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试述农民运动讲习所的办学特色。

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下列图形中箭头所指的“点”违背哪条Westgard基本质控规则

A. 41s
B. 13s
C. 22s
D. R4s
E. 10Xbar

One disadvantage of using robots is that they consume__________.
A too much energy
B based on American designs
C they are too costly
D they are not reliable
E good to quality control
F free of charge

生态农业将物质和能量多层次循环利用，下图（图3）中的①、②、③分别是（）

A. 畜牧场、沼气池、农田
B. 农田、畜牧场、沼气池
C. 沼气池、农田、畜牧场
D. 畜牧场、农田、沼气池

We didn't know his telephone number, otherwise we______________ him.
[A] would have telephoned
[B] must have telephoned
[CJ would telephone
[D] had telephoned