观察钩端螺旋体，最好使用下列何种显微镜()
A．荧光显微镜
B．倒置显微镜
C．普通光学显微镜
D．暗视野显微镜
E．电子显微镜
参考答案：D
Ted has made up his mind to give it up, but on _____ second thoughts he determined to try______ third time．
A．/ ; a
B．/ ; /
C．a ; a
D．the ; a
简述市盈率乘数法的基本思路
