某些有机含氮化合物在钠溶法中不形成NaCN,而转变成()逸出。
A.N2
B.HCN
C.RNH2
D.RN=NR
参考答案:A
People have strange ideas about food. In the 18th century, people in the USA g 小题1: tomatoes, but they never a 小题2: them. They thought tomatoes were d 小题3: food. People called them poisonous (有毒的) apples.
Thomas Jefferson was a learned president (有学问的总统) and he knew people in Paris enjoyed the nice t 小题4: of tomatoes. He wanted his people to enjoy tomatoes, but h 小题5: could he change their ideas?
Jefferson grew some tomatoes in his garden. And he t 小题6: his cook to cook tomato soup (汤). Then he held a party. There was p 小题7: of tomato soup on the table. He invited visitors to try the soup. He wasn’t s 小题8: when he found all of them liked the soup. Of course, he n 小题9: told them they were eating poisonous apples.
Soon a 小题10: that, more and more Americans loved tomatoes.
通脉四逆汤中重用的药物是()
A.附子
B.干姜
C.生姜
D.甘草