诊断急性菌痢必做的检查是（）
A.血常规
B.粪便常规
C.直肠镜
D.血培养
E.悬滴检查
参考答案：B
Last night I came across the man ____ you think is pleasant to ________.
A．who; get along
B．whom; get along
C．who; get along with
D．whom; get along with
精密度的最好表示方法是（）
A．极差；
B．平均偏差；
C．标准偏差
