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【简答题】
己二酸和己二胺合成分子量为10000的尼龙-66,计算: (1)己二酸146g,己二胺116g,反应程度为0.995,需加苯甲酸多少克? (2)反应程度仍为0.995,若用116克己二胺,不加苯甲酸,则需己二酸多少克? (原子量C:12、O:16、H:1、N:14)
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举一反三
【简答题】Listen carefully and answer questions.
【简答题】Listen carefully and make proper responses
【简答题】Listen carefully and make proper responses
【单选题】Some works of literature hold one's interest to the very last page, but others serve only as a ______, to be kept handily at a bedside table.
A.
reference
B.
soporific
C.
pleasure
D.
reminder
【单选题】hold one’s feet to the fire
A.
scold one severely for a mistake
B.
do some bad things secretly
C.
get control over someone or something.
D.
ruin one’s own plan through foolish words
E.
to put pressure on someone to do something
【单选题】hold one’s feet to the fire ( )
A.
do some bad things secretly
B.
get control over someone or something.
C.
ruin one’s own plan through foolish words
D.
to put pressure on someone to do something
【简答题】Listen carefully and make proper responses
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