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【单选题】
天然乳化剂中（）是有亲水性的，可以形成油型乳化液A.
沥青
B.
胶质
C.
环烷酸
D.
脂肪酸
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皮皮学刷刷变学霸
举一反三
【单选题】Section A Directions: In this section, you will hear three conversations. At the end of each conversation, you will hear one question. Both the conversations and the questions will be spoken only once...
A.
The teacher encouraged and helped the student to do well in her political science class.
B.
The teacher gave the student a satisfying grade.
C.
The teacher persuaded the student to economize his budget.
D.
The teacher encouraged and helped the student to do well in economics class.
【单选题】Both the police and the workmen were grateful to the student for _______ in advance. [ ]
A.
they had been informed this
B.
their informing of this
C.
informing them of this
D.
having informed them this
【简答题】在原理图编辑器中,图纸的设置可通过执行菜单 ____→____ 命令实现。
【单选题】Both the student and his teacher_____sure that he will pass the exam.
A.
be
B.
is
C.
are
【多选题】Procaine具有如下性质:
A.
易氧化变质
B.
水溶液在酸性条件下相对稳定,中性、碱性条件下水解速度加快
C.
可发生重氮化偶合反应。
D.
氧化性
E.
弱酸性
【简答题】根据苷键原子的不同,苷类可分为:。 N-苷、O-苷、 、 , 其中氧苷为最常见 。
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