弹性体改性沥青防水卷材延伸率试验夹具间距离为（），夹具宽度不应小于50mm
A.150mm
B.210mm
C.200mm
D.190mm
参考答案：B
You are really very kind. I’ll never forget the _________ you have done to me.
A．favour
B．deed
C．help
D．good
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