细菌的大小(Size of Bacteria) ■微米（μm) 细菌的形态与排列(Shape of Bacteria) ■球菌coccus ■杆菌paci lus 螺形菌spiral bacter ium 细菌的大小(Size of Bacteria)  微米(μm)  球菌coccus  杆菌bacillus  螺形菌spiral bacterium 细菌的形态与排列(Shape of Bacteria)