伸缩调节器尖轨或基本轨的轨头擦伤、剥落或低塌可采取()处理。
A、观测
B、焊补
C、打磨
D、更换
参考答案:B
When the Greeks had _____ the Persians, a soldier ran from Marathon to Athens.
A.won
B.bitten
C.beaten
D.hit
共有几个变压整流组件(TRU)()
A.5
B.4
C.3
D.2