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【单选题】
下列化合物不能由酪氨酸合成的是（）A.
甲状腺素
B.
苯丙氨酸
C.
肾上腺素
D.
黑色素
E.
多巴胺
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举一反三
【单选题】—May I speak to Miss Brown , Please? — ____________
A.
Who are you?
B.
Who’s this?
C.
This is Miss Brown .
D.
My name is Kate Brown.
【判断题】Addressing forms like “Miss Mary”, “Brown” by the Chinese may be a form. of cultural compromise.()
A.
正确
B.
错误
【单选题】The students ______ busily when Miss Brown went to geta book she ______ in the office.
A.
had written left
B.
were writing hasleft
C.
had written had left
D.
were writing had left
【单选题】Miss Brown is the ______president, though her title is secretary.
A.
sole
B.
ultimate
C.
virtual
D.
comparative
【简答题】This is Miss Brown. Her name is Alice Brown. She is from America. Her telephone number is 8257-6632. She is from America. She is nice. She is a good teacher. I like(喜欢) Miss Brown very much. 根据短文内容，完成...
【简答题】2 弹簧下面悬挂质量为50 g的物体,物体沿竖直方向的运动学方程为 x=2sin10t,平衡位置为势能零点(时间单位:s, 长度单位:cm)。(1) 求弹簧的劲度系数,(2) 求最大动能,(3)求总能。
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