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【简答题】
生物碱的氮原子周围引入吸电子基团，使生物碱碱性（），如石蒜碱的碱性（）氢石蒜碱。
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皮皮学刷刷变学霸
举一反三
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【多选题】在 II 栏中找出与 I 栏中相对应的句子 I II 6. ( ) What course are you taking?
A.
Cooking. 7. ( ) Hello, my name is Jack.
B.
I’m outgoing and helpful. 8. ( ) Is it far to walk ?
C.
Hello, I’m Peter. 9. ( ) How would you describe yourself?
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Yes, the name is Joe Smith. 10. ( ) Do you have a reservation?
E.
No. It’s about five minutes’ walk
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