血栓形成的主要原因有（）
A.心源性休克
B.血液浓缩
C.心室内膜粗糙
D.涡流形成
E.以上均不是
参考答案：C, D
There is no doubt ________. [ ]
A. that Mr. Hansen is in good health
B. whether is Mr. Hansen healthy
C. if Mr. Hansen's health was returning
D. whether Mr. Hansen in health
城市地质灾害
