A.
B.
C.
D.
[单选题]A.B.C.D.
[单选题]A.1.95B.1.75C.1.65D.1.45
[单选题]A.4B.5C.6D.8
[单选题]A.保持功能B.置“0”功能C.置“1”功能D.计数功能