低速继电器SDJ在速度低于0.5m/s时,释放;当速度高于1.5m/s时,吸合。
参考答案:对
China sent up Shenzhou V manned spaceship into space successfully, which shows science and technology ___ rapidly in China.
A.have been developing
B.develops
C.is developing
D.has developed
()和()应当重新申请注册。