不属于隧道施工质量检测范畴的是______。
A．钢筋检测 B．开挖质量检测 C．防排水检测 D．支护质量检测
参考答案：A
________they visited the Science Museum, they showed great interest in everything they saw. [ ]
A. The first time
B. For the first time
C. At first
D. At the first time
DNA二级结构形式是
A．α-螺旋B．三叶草型C．β-片层D．双螺旋E．无规则卷曲
