DR相比于CR（）.
A.成像时间短
B.X线利用效率高
C.图像质量好
D.系统成本高
E.以上都是
参考答案：E
下列不属于津液的排泄途径是：（）。
A.汗
B.尿
C.粪
D.呕吐物
E.呼气
They had to ________ their lives against weather and wild animals. [ ]
A. struggle for
B. lead to
C. treat as
D. contribute to
