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