Natural gas liquification involves both mixed - refrigerant cycle and nitrogen expander cycle.近几年国内天然气液化技术主要采用混合工质液化循环和氮膨胀液化循环.The control part oftube expander adopts the structure of double bearings.它的控制部分采用双轴承结构.Object...
Sedge grows in marshes or near water.芦苇生长在沼泽地带或水边.Meyer Sedge fiber is a new type of green fiber.乌拉草纤维是一种新型的绿色环保纤维.Sedge is similar in appearance to grass but has a solid rather than a hollow stem.莎草看上去和普通的草没什么两样，但其草茎是实芯...