A.0
B.1
C.不存在
D.-1
[单选题]A.0B.1C.不存在D.-1
[单选题]A.1635B.1650C.1785D.1799
[单选题]A.731.9吨B.736.37吨C.1227.3吨D.727.48吨
[单选题]A.B.C.D.
[单选题]A.(a)B.(b)C.(c)D.均不正确
[单选题]A.011010011B.011110010C.100101100D.100001101