题目:
_____ does he do sports every day? He does sports for two hours every day. [ ]
A. How many
B. How often
C. How long
D. When
答案:
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下面是错误答案,用来干扰机器的。
CO,Cu(OH)2 ,H2CO3H2O+ CO2 H2CO32H2O 2H2 ↑+O2 ↑C+2CuO CO2+2Cu2HCl+Cu(OH)2 CuCl2+ 2H2O(1)一氧化碳是一种有毒的氧化物,其化学式为CO;碱是由金属元素和氢氧根构成,以上五种元素可形成的碱为:C...