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【单选题】
下列不属于营养必需氨基酸的是A.
Met
B.
Phe
C.
Lys
D.
Trp
E.
Tyr
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皮皮学刷刷变学霸
举一反三
【单选题】---Mr. Smith, I seem to have caught a fever and feel sleepy. ---____, you’d better see a doctor as soon as possible.
A.
If not
B.
If so
C.
If any
D.
If ever
【单选题】关于神经纤维静息电位的形成机制,下述哪项是错误的
A.
细胞外的 K + 浓度小于细胞内的浓度
B.
加大细胞外 K + 浓度，会使静息电位值加大
C.
细胞膜对 Na + 也有较小的通透性
D.
细胞膜主要对 K + 有通透性
E.
主要是 K + 外流所形成的电—化学平衡电位
【单选题】If possible, you’d better get familiar with the following elements about the actual room, except ___________.
A.
the acoustics
B.
the temperature
C.
the equipment available
D.
the lighting
【单选题】-Customer: ______ if you’d serve me as soon as possible as I’ve got an appointment at two fifteen.-Waiter: I’ll do my best, Madam.
A.
It would be very kind of you
B.
It would be very helpful
C.
I’d be most delightful
D.
I’d be most grateful
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