A.32.20m B.33.20m C.34.20m D.35.20m
A.100 B.80 C.60 D.50
A.94mm B.108mm C.158mm D.180mm
A.e0为0.57m，e0<0.75ρ B.e0为0.72m，e0<0.75 C.e0为0.57m，0.75ρ0<ρ D.e0为0.72m，0.75ρ0<ρ
A.3.5、4 B.4、5 C.4、4.5 D.5、6
A.1200 B.1100 C.1000 D.900
A.kT=3.04>1.60，满足 B.kT=1.31<1.60，不满足 C.kT=2.31>1.60，满足 D.kT=1.50<1.60，不满足
A.142.60 B.156.58 C.162.74 D.175.51
A.45 B.50 C.55 D.60
A.36 B.28 C.38 D.48
