圆锥病变可出现：（）
A.假性尿失禁
B.真性尿失禁
C.充盈尿失禁
D.尿潴留
参考答案：B
I had great difficulty _____ the suitable food on the menu in that restaurant. [ ]
A. find
B. found
C. to find
D. finding
没有香气的木类药材是（）
A.沉香
B.降香
C.苏木
D.檀香
E.关木通
