什么叫加热输送?适用于哪种原油?
参考答案:
在输送管道的起点设置加热设备,对原油加热,采取这种方法输送原油称为加热输送。加热输送适用于高含蜡,高凝固点,高粘度易凝原油。
把太湖水位比警戒水位高0.2米,记为+0.2米,那么比警戒水位低0.25米,记作-0.25-0.25米.
It was dark and he had already lost his ________of direction.[ ]
A. thought
B. feeling
C. idea
D. sense