产幼虫于宿主眼内的线虫是( )
A.美丽筒线虫
B.结膜吸吮线虫
C.旋毛形线虫
D.广州管圆线虫
E.丝虫
参考答案:B
男,25岁,胸闷,气短12天,伴乏力、低热、盗汗,左侧腋后线第7肋间以下语颤减低,叩浊,呼吸音减低,腹部正常,拟诊考虑为()。
A.胸膜间皮细胞瘤
B.大叶性肺炎
C.充血性心衰
D.结核性胸膜炎
E.肝硬化
If marginal cost is above the average cost, when you produce your next unit:()
A. average cost will decline.
B. marginal cost will remain unchanged.
C. average cost will increase.