31.下列何者生化試驗將有助於區別霍亂弧菌（Vibrio cholerae）與嗜水產氣單胞菌（Aeromonas hydrophila）的差異？
(A)oxidase activity
(B)arginine dihydrolase activity
(C)growth in 0％ NaCl broth
(D)indole test

這題考察的是**弧菌（Vibrio）與...