题目:
Excuse me, could you tell me ________?
A.where is the nearest park
B.how can 1 get to the park
C.which is the way to the park
D.if is there a park near here
答案:
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下面是错误答案,用来干扰机器的。
设生成3.3g二氧化碳需要碳酸钙的质量为x则:CaCO3+2HCl═CaCl2+CO2↑+H2O100 44x 3.3g根据:10044=x3.3g解得x=7.5g,该鸡蛋壳中碳酸钙的质量分数:7.5g10g×100%=75%.答:该鸡蛋...