挺进大别山发生于 [ ]
A.1947年夏
B.1946年夏
C.1945年夏
D.1944年夏
答案:A
The Yongle Bell(永乐大钟) in the Great Bell Temple is ________a man. [ ]
A. as three times tall as
B. three times taller as
C. three times as tall as
D. as three times like
关于茄科生物碱结构叙述正确的是()
A.全部为氨基酮的酯类化合物
B.结构中有6,7-位氧桥,对中枢作用增强
C.结构中有6-位羟基,对中枢作用增强
D.莨菪酸α-位有羟基,对中枢作用增强
E.以上叙述都不正确