若孔板的厚度超过（），则其开孔下游出口处应做成一个扩张的圆锥面. ["0.005D","0.02D","0.05D","0.2D"]
孔板孔径的单测值与平均值之差应不大于平均值的（）. ["±0.2%","±5%","±0.05%","±2%"]
外汇按其买卖的交割期，可分为（） ["A、远期外汇","B、贸易外汇","C、非贸易外汇","D、即期外汇"]
输差是指一条管线每日输入气量与（）之差. ["设计输送量","计算通过量","管道储气量","输出气量"]
影响输差的因素正确的是（） ["管长","管直径","管容计算值","输效"]
骨灰葬单人墓占地为多少平方米？双人墓占地为多少平方米？
