活塞压缩机的压缩过程属于（）。
参考答案：等焓压缩
The girl _______ bike you took just now _______ at it．
A．her; very cross
B．her; was very cross
C．whose; to be very cross
D．whose; is very cross
网络负载均衡的三种需求模型？（）
A.智能流量转发
B.消除性能瓶颈
C.提高设备利用率
D.提高系统扩展性
