腹部手术应采取
A．颈仰卧位B．仰卧位C．侧卧位D．俯卧位E．截石位
参考答案：B
. The book, _______ is blue, is mine.
A．the cover of which
B．whose cover
C．of which the cover
D．all the above
每张图纸上必须有标题栏，标题栏应位于图纸的（）。
A.左上角
B.右上角
C.右下角
D.右上角
