架空线路的横担安装应平整，横担端部左右扭斜不应超过( )。
A．10mm
B．20mm
C．25mm
D．30mm
参考答案：B
_____ the chapter four times, I finally understood the author's theory．
A．Reading
B．Having read
C．To read
D．Read
后房型人工晶状体使物像放大（）
A.O%～1%
B.1%～2%
C.2%～3%
D.3%～4%
E.4%～5%
