钢性组合罐道的截面是空心矩形，一般由（）焊接而成。
A.型钢
B.槽钢
C.钢轨罐道
D.特种钢
参考答案：B
It is the prevention of disease ______ its successful treatment that has led to the rapid increase of the
world's population. [ ]
A. rather than
B. more than
C. other than
D. less than
对Z轴分辨率影响最大的是：（）
A.扫描视野
B.扫描范围
C.扫描层厚
D.图像矩阵
E.重建算法
