问题
选择题
Many of them turned a deaf ear to his advice, even though they knew it to be _____.[ ]
A. valuable
B. reliable
C. flexible
D. acceptable
答案
答案：A
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Many of them turned a deaf ear to his advice, even though they knew it to be _____.[ ]
A. valuable
B. reliable
C. flexible
D. acceptable
答案：A
，再经NaOH溶液处理，容器内几乎成为真空。该烃的化学式为（ ）