站内正线、到发线与其相邻的线路最小线间距离为()米。
A、4
B、5.3
C、5
参考答案:C
透镜中,中间厚、边缘薄的叫______镜,边缘厚、中间薄的叫做______镜,凸透镜对光线有______作用,凹透镜对光线有______作用,日常生活中,老年人戴的老花镜属于______镜,近视眼镜属于______镜,照相机的镜头相当于______镜,它成的是______、______、______像.
The foreiger knows little about ______ is called "Hope Project" in China.
A.what
B.that
C.which
D.it