放样是属于（）中的命令。
A.标准几何体
B.扩展几何体
C.复合几何体
D.二维线性
参考答案：D
---Where do Tom and John sit ?
--- Tom sits __________ of the room and John sits _________ of the room.
A．in front; at back
B．in the front; at the back
C．in front; at the back
D．in the front; at back
培养痢疾杆菌时，采取粪便标本应注意什么？
