染色后，多杀性巴氏杆菌呈两极着色的染色方法是（）
A.革兰氏染色
B.美蓝染色
C.抗酸染色
D.柯氏染色
E.瑞氏染色或美蓝染色
参考答案：E
14．--- I ______ to be here on time.
--- But you ______ late again.
A．meant; are
B．meant; had been
C．have meant; were
D．have meant; are
芽梢密度（Shoot density）
