汽缸压力表用于测量汽缸内（）行程时的空气压力。
A．进气
B．压缩
C．作功
参考答案：B
对胆汁淤积性黄疸最有诊断价值的是（）
A.阻塞性脂蛋白X
B.尿胆红素
C.ALP
D.GCT
E.结合胆红素
You can not imagine the difficulty they had ____ the problem. It isn't ____ easy. [ ]
A. to solve; so
B. solved; so
C. solving; that
D. solved; that
