财务杠杆运用的前提是息前资产获利率大于借款利率。
参考答案：对
When they______ the village , they found the two girls were not there.[ ]
A. returned
B. returned to
C. returned back
D. returned back to
急性腹痛病人表现为持续性腹痛阵发性加剧伴有休克者，最大可能是（）
A.输尿管结石
B.急性阑尾炎
C.急性胆囊炎
D.绞窄性肠梗阻
E.急性盆腔炎
