下列哪项检查容易引起尿系感染
A.肾盂造影
B.导尿
C.核素肾图检查
D.肾穿刺
E.血液透析
参考答案:B
The natural reserve is ______ large that you have to take shuttles to visit different sections in it. [ ]
A. such
B. very
C. too
D. so
在轧制过程中,由于压下变形造成的轧件轧后宽度比轧前宽度的增大现象称为宽展。