ZPW-2000A型无绝缘轨道电路调谐区（JES-JES）按（）m设计，实现两相邻轨道电路电气隔绝。
A.20
B.18
C.29
参考答案：C
I want to know _____ the day before yesterday. [ ]
A. what you do
B. what do you do
C. what you did
D. what did you do
我国国际经济合作中的加工贸易合同可以适用"公约"。
