黏膜内癌的肉眼类型是
A.火山口溃疡状 B.Krukenberg瘤 C.左锁骨上淋巴结转移 D.皮革状 E.表浅型胃癌
参考答案:E
Prehistoric (史前的) people _____________ their food on a fire. [ ]
A. cook
B. cooked
C. was cooking
D. cooks
物流成本支出与物流服务水平是()关系。
A.线性
B.非线性
C.非线性同比例
D.非线性反比例