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【判断题】
醛、酮、羧酸、酯的羰基的伸缩振动在红外光谱上所产生的吸收峰频率是不同的。 醛、酮、羧酸、酯的羰基C=O的伸缩振动在红外光谱上所产生的吸收峰频率是不同的。A.
正确
B.
错误
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举一反三
【单选题】I was talking with my mother on the phone when we were _______ suddenly.
A.
cut down
B.
cut off
C.
cut across
D.
cut back
【多选题】小肠是吸收的主要部位，因为
A.
小肠长达5～6米
B.
食物在小肠内已加工成可吸收形式
C.
小肠粘膜上皮的吞噬作用强
D.
食物在小肠内停留时间长
E.
小肠粘膜上有皱褶和绒毛
【单选题】Not earning enough money this month, I had to ____ my expenses. [ ]
A.
cut off
B.
cut in
C.
cut down
D.
cut across
【单选题】Could you ___ my meat ___for me please Daddy?
A.
cut, down
B.
cut, up
C.
cut, out
D.
cut, into
【单选题】Not making enough money last month, I had to ________ my expenses. [ ]
A.
cut in
B.
cut off
C.
cut across
D.
cut down
【单选题】My teacher said my composition was too long. I must ______ to about 3,000 words.
A.
cut it off
B.
cut it up
C.
cut it down
D.
cut it out
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