开行重载货物列车的车站到发线有效长一般是()。
A、750m
B、850m
C、950m
D、1050m
参考答案:D
It is postulated that population trends have an effect on economic fluctuations.
A.challenged
B.assumed
C.deducted
D.decreed
球后穴位于眶下缘的
A.外1/3与内2/3交点处
B.内1/3与外2/3交点处
C.直对瞳孔处
D.外1/4与内3/4交点处
E.内1/4与外3/4交点处