HL8-4S-11离心式压缩机PT—322表示（）。
A.二级出口压力
B.三级出口压力
C.一级出口压力
参考答案：A
Accoding to the old stories of Iceland and Norway,Eric the Red was forced to leave Iceland because he had committed a murder,_______he got into trouble.
A.for which B,at which C.in which D.with which
元宵节的最早的名称为（）
A.正月十五
B.上元节
D.灯节
