A型显示的探伤仪时基线纵坐标代表（）。
A、回波幅度
B、回波时间
C、回波声程
D、探头位移距离
参考答案：A
He feels that his health ____ owing to ____ a long walk every other day.
A．is improving; taking
B．has been improved; being taken
C．improved; taken
D．is improving; have taken
若承包商C以1100万元的报价中标，合同工期为11个月，合同工期内不考虑物价变化，承包商C工程款的现值为多少
