在催化剂预硫化过程中只有在切换VGO后才能启动注水泵向高压空冷系统注水。
参考答案:对
—Your coat looks very nice. What’s it made ?
—Cotton, and it is made Wuhan.
A.from; in
B.of; in
C.from; on
D.of; on
什么是相对运动雷达?有哪几种显示方式?各有什么特点?如何使用?