在水泥混凝土路面轨道式摊铺机施工中,安装轨道及模板时,相邻模板间距离误差为()。
A.≤1mm
B.≤2mm
C.≤3mm
D.≤4mm
参考答案:A
Is there _______ in today's newspaper?[ ]
A. important something
B. nothing important
C. important anything
D. anything important
空穴效应