60AT-12号单开道岔转辙器采用()AT尖轨。
参考答案:弹性可弯式
The Expo site should be _______ from anywhere in the city of Shanghai within 90 minutes by bus, subways and special taxis.
A.adoptable
B.acceptable
C.available
D.accessible
1:N支路保护指示灯有()
A.TPC
B.TPS
C.TPM
D.TPN