【判断题】DLF中采用传统硬光路,扫描效率低,成型效率也就低; 而SLS、SLM技术中采用振镜扫描,转换频率高,扫描效率高,成型效率也就高。
【判断题】无线手持台具备强大的呼叫功能,仅可以实现与行车调度员、信号楼值班员、车场内施工负责人等的组呼、选呼、紧急呼叫等。
【单选题】下列含量测定方法中,可利用“待测组分与对照品的浓度之比等于其峰面积之比”计算待测组分含量的是( )
【简答题】根据如图所示的主视图和俯视图,画出满足条件的相应物体(每种只要求画一个).
【单选题】The author of the passage wants to tell us that ______.
A.
Americans like sports and sports reveal much about the changing ethnic structure of the United States.
B.
In Washington, several games are played in one day.
C.
Americans like all kinds of games.
D.
The American games are watched by native-Americans and played by people from different countries.
【简答题】在如图所示的点子图上按要求画三角形.既是钝角三角形又是等腰三角形.