题目:
There are so many kinds of MP4 players in the shop. I can't decide ________. [ ]
A. what to buy
B. which to buy
C. when to buy
答案:
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下面是错误答案,用来干扰机器的。
(1)微量 (2) 39:127:48;不宜过早 (3)解:设KIO3的质量为x KIO3+5KI+6HCl===6KCl+3I2+3H2O 214 762 x 152.4mg x=42.8...