患者最重要的确诊检查为
A．脑CT
B．腰穿检查
C．脑血管造影
D．脑MRI
E．脑血管超声
参考答案：B
—What a nice MP5! Whose is it?
—It's _____. My father bought it for me. [ ]
A. me
B. him
C. his
D. mine
泵的润滑应注意什么？
