在急性阿米巴痢疾患者的粪便内可查到（）
A.包囊
B.大滋养体
C.小滋养体
D.包囊和滋养体
E.大滋养体和小滋养体
参考答案：B
Only two of the students worked the maths problem out correctly. _____ all did it wrong. [ ]
A. Other
B. Others
C. The other
D. The others
一般照明高度达不到要求时应采用（）V电压。
A.110
B.42
C.36
D.6
