鉴别腹股沟直疝与斜疝最有意义的检查是()。
A.发病年龄
B.疝内容物是否进入阴囊
C.是否易嵌顿
D.回纳疝内容物后,压住内环区,增加腹压,疝块是否脱出
E.疝块的形状
参考答案:D
— ________ the editor at the airport?
— No, he ________ away before my arrival. [ ]
A. Have you met; has driven
B. Had you met; was driven
C. Did you meet; had been driven
D. Have you met; had driven
读零件图分析尺寸时,首先要找出尺寸基准。