【多选题】What kind of objects should be presented for inspection at X-ray? Medicines, baby food and milk over 100ml must be presented for inspection at X-ray, including all metal objects with you.
【单选题】下列四种放射性同位素中,可用来透照厚度为2~10mm的薄壁管,辐射特性类似于150~250KVX射线的是()
【简答题】蒹葭中追求者是这样追寻伊人的:( )( )。
【判断题】动物的应激反应对动物生存而言永远是有益的。()
【判断题】品种法适用于简单生产和在管理上要求计算半成品成本的连续式多步骤生产。( )
【判断题】处理邻里关系的原则是“各扫自家门前雪”。
【单选题】What kind of things does a 3D printer make?
B.
A three-dimensional object.
C.
Objects made layers upon layers.
D.
A sheet of two dimensional paper.