题目内容

下列卵巢肿瘤来源于体腔上皮()

A. 内胚窦瘤
B. 皮样囊肿
C. 纤维瘤
D. 透明细胞癌
E. 浆液性囊腺瘤

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临床上常见的巨大良性卵巢肿瘤为()

A. 畸胎瘤
B. 颗粒细胞瘤
C. 卵泡膜细胞瘤
D. 粘液性囊腺瘤
E. 浆液性囊腺瘤

晶闸管关断的条件()

A. 加反向控制极电压
B. 去掉控制极电压
C. 阳极电流低于维持电流
D. 阳极和控制极均加正极性电压

关于普通晶闸管结构,说法正确的为()

A. 4层3端半导体器件,有2个PN结
B. 4层2端半导体器件,有3个PN结
C. 4层3端半导体器件,有3个PN结
D. 4层4端半导体器件,有3个PN结

1.Imagine. 3,000 feet in the air. No ropes, no harness, no safety net. _________.2.If you are seeking_________, free soloing is the closest you can get.3.Last year, he set his sights_________, El Capitan, a 3,000-foot vertical granite rock face in Yosemite National Park.4.El Capitan is the most impressive wall on earth. It’s is 3,200 feet of sheer granite. It’s the_________.

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