食管下段癌,上纵隔淋巴结转移率约为()
A.40%
B.30%
C.20%~30%
D.10%左右
E.0
参考答案:C
Who will ______ your dog when you all go out for a holiday?
A.keep down
B.look for
C.attend to
D.take to
下列哪项可最有效地改善血液流变()
A.维持循环血容量
B.纠正低蛋白血症
C.血液稀释
D.提高吸氧浓度
E.抗血栓药治疗