进行混凝土外加剂收缩率比试验，恒温恒湿室的湿度为（）。
A.50±10％
B.55±10%
C.60±10%
D.60±5%
参考答案：D
— I didn't know it a one-way street, officer.
— ______. [ ]
A. That's all right
B. I don't believe you
C. Sorry, but that's no excuse
D. You don't say that
经营行在完成现场延伸检查后，应撰写检查报告。如发现风险信号，原则上要求于（）个工作日内反馈至上级监管行。
A．3
B．5
C．7
D．10
