采集机由单元板组成，应具有具有（）功能，板级故障有提示。
参考答案：自检
— You could have asked Mr. Richard for help. He’s kind-hearted.
— Yes. But that _______ him a whole day.
A．would have taken
B．had taken
C．would take
D．took
一般水尺当新测高程与原用水尺零点高程相差小于等于（）mm时，其水尺零点高程仍沿用原高程。
A、5
B、10
C、15
D、20
