分离挥发油中的醛类成分，通常加入何种试剂
A．NaHSO3
B．5%NaHCO3
C．丁二酸酐
D．Girard试剂
E．均可以
参考答案：A,D
As a result of the earthquake, two-thirds of the buildings in the area _____. [ ]
A. need repairing
B. needs repairing
C. needs to be repaired
D. need to repair
不具有肩胛横突肌的动物是（）
A.马
B.牛
C.猪
D.狗
E.猫
