双动道岔的一动、二动是如何规定的?表示二极管在哪动道岔?
参考答案:
靠近站内的道岔为第一动道岔,远离站内的那一动为第二动;表示二极管在二动道岔(如双机牵引在二动的付机中)。
So suddenly _____ the disease that the whole family were at a great loss.
A.did he catch
B.he caught
C.was he caught
D.he was caught
中间包冶金