在明确病因的病例中，缩窄性心包炎的主要病因是
A．尿毒症性心包炎B．化脓性心包炎C．血心包D．结核病E．非特异性心包炎
参考答案：D
I was about to give up when it suddenly ________ to me that I should try to solve the problem in another way.[ ]
A. referred
B. adapted
C. occurred
D. adjusted
简述地层测试的方法过程。
