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【单选题】
下列哪种物质难以通过无蛋白的人工膜：（）A.
氨基酸
B.
丙酮
C.
尿素
D.
二氧化碳
E.
苯
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反馈参考答案：
举一反三
【单选题】The main advantage of a cyclic list is ________.
A.
Scan the entire chain table from any node in the table
B.
No longer need the head pointer.
C.
can quickly access the direct precursor of certain node
D.
Avoid list breaking when performing insertion and deletion operations
【判断题】The main ways to settle disputes in international trade are negotiation, mediation, arbitration and litigation .
A.
正确
B.
错误
【单选题】What is the main reason that Andy offered to help the prison guards settle their tax payments?
A.
He wanted to earn some money to buy beers for his inmates.
B.
He wanted to make friends with the prison guards.
C.
He wanted to create a better living condition for his inmates.
D.
He wanted to show off his expertise in his profession.
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