单选题:From the text we can infer that

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  • 题目类型:单选题
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题目内容:
From the text we can infer that A.it' s universally accepted that it is possible to improve one' s IQ
B.there is nothing in common between IQ and EQ
C.a person with high EQ is willing, to take risks
D.a person with low EQ is likely to sympathize with other people
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答案解析:

可一次将FeCl3、FeCl2、NH4Cl、NaCl、AlCl3。等五种溶液鉴别开的试剂是__________。

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常温下某盐酸溶液的pH=2.0,则此溶液中的OH-浓度为__________mol/L;若将此溶液用水稀释至原来浓度的l/10,则稀释后溶液中0H-浓度为___

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What work does the farmer need to do? A.Irrigate my fields B.Apply pesticides C.

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(12分)如图所示的电路中,R1=1Ω,R2=2Ω,R3=3Ω,R4=4Ω,E=4V,r=0.2Ω。(1)K1接通、K2断开时,通过R1和R2的电流之比多大?

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