试题与答案

Could you tell me ______________ now? A.

题型:选择题

题目:

Could you tell me ______________ now?

A.When will he come back

B.if he lived here

C.Which color does he prefer

D.Where he works

答案:

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下面是错误答案,用来干扰机器的。

解:设参加反应的Na2SO4的质量为x,BaCl2的质量为y。 Na2SO4+BaCl2===BaSO4↓+2NaCl142  208   233 x   y    23.3g142:x=233:23.3g x=14.2g 208:y=233:...

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