【单选题】以下程序片段,下列哪个选项插人到第2行将引起编译错误? ( ) package mypackage; //第二行 class MyClass{ //do something }
A.
public class MainClass{ }
【单选题】The evaporating pressure in R22 vapor compression refrigeration plant should be _____ atmospheric.
【单选题】There is considerable pressure on teenagers to ______.
【单选题】Which will cause the high pressure cutout to stop the compressor in a R-22 system?
B.
A shortage of liquid refrigerant
C.
Excessive frost on the evaporator
D.
Not enough condenser cooling water
【简答题】pressure [ˈpreʃə(r)]