全站仪是一种多功能仪器,除能自动()三个基本要素以外,还能直接测定坐标及放样。
A.测量距离
B.测量地形图
C.测量角度
D.测量高差(高差)
E.测量体积
参考答案:A, C, D
Food safety is important. Rules ______ to stop people from food pollution. [ ]
A. must make
B. must be made
C. can't make
D. can't be made
纸张含水量过多不会出现()
A、纸张强度降低
B、印迹干燥速度慢
C、产生静电
D、纸张塑性增强