读图,位于a和b两个界面之间的地球内部圈层是
A.地壳
B.地幔
C.内核
D.外核
答案:B
本题考查地球的内部圈层。图示a 表示古登堡界面,b 表示莫霍界面,故之间是地幔。
男性,51岁,上腹部隐痛不适1年,近2个月来加剧;入院查体腹平坦,上腹有轻压痛,未触及肿物,大便潜血试验(+),上消化道造影检查显示胃窦部小弯侧黏膜纹理紊乱,胃壁僵硬,未见明显充盈缺损。该患者首先应考虑
A.慢性胃窦炎
B.胃溃疡
C.胃癌
D.胃黏膜脱垂
E.萎缩性胃炎
An investor has the following assets: $ 5000 in bonds with an expected return of 8%. $ 10000 in equities with an expected return of 12%. $ 5000 in real estate with an expected return of 10%. What is the portfolio's expected return()
A. 10.00%.
B. 10.75%.
C. 10.50%.