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:...