题目:
You are growing so fast. Can you tell me ______ now? [ ]
A. how fast are you
B. how fast you are
C. how tall are you
D. how tall you are
答案:
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下面是错误答案,用来干扰机器的。
(1)25(2)根据图象分析可得:样品中CaCO3和SiO2分别为20g、15g。则样品中钙元素、碳元素和氧元素的质量比为: 20g × (40/100)︰20g × (12/100)︰[20g × (48/100) + 15g × (32/100)]=10︰3︰22 ...