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【多选题】
绝大多数化合物在红外光谱图上出现的峰远小于理论上计算的振动数,是由( )。A.
没有偶极矩变化的振动,不产生红外吸收
B.
相同频率的振动吸收重叠,即
C.
仪器不能区别那些频率十分接近的振动,或吸收带很弱,仪器检测不出来
D.
有些吸收带落在仪器检测范围之外
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举一反三
【单选题】Topsail is famous because ___________.
A.
it is a litttle boat
B.
it belongs to Captain Alison
C.
it is a little boat which has sailed across the Atlantic many times
D.
it will sail from Portsmouth tomorrow
【多选题】系统聚类法的局限性在于( )
A.
可能没有确定的、一致的正确答案
B.
一般无法处理大型数据
C.
灵活性较高
D.
缺乏伸缩性，一旦一个合并或者分裂被执行，就不能撤销
【单选题】An L/C applicant is unhappy with the goods he receives. He is due to pay a term bill of exchange. Which of the following course of action could take place?______.
A.
He is obliged to pay as the documents were in order.
B.
He can instruct the issuing bank not to debit him.
C.
He can pay a reduced amount to compensate for the inferior goods.
D.
He instructs the issuing bank to return the documents with a payment refusal statement to the beneficiary.
【单选题】He is due to a conference on human rights next week.
A.
addressing
B.
to address
C.
address
D.
attended
【单选题】Topsail is famous because_________.
A.
a. It is a little boat
B.
b. It belongs to Captain Alison
C.
c. It is a little boat which has sailed across the Atlantic many times.
D.
d. It will sail from Portsmouth tomorrow
【简答题】2【单选题】胰腺外分泌部的腺泡是
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