为了使转辙器轨距、方向正确及尖轨和基本轨密贴,曲基本轨应按支距进行弯折。一般情况下曲基本轨有()曲折点。
A.一个
B.两个
C.三个
D.四个
参考答案:B
Bats are surprisingly long-lived creatures, some ______ a life span of around 20 years.
A. having B. had C. have D. to have
基于物理的深亚微米MOSFET模型考虑了哪些内容?