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【单选题】
Government bans on the dumping of sludge anywhere in the ocean are based on the belief that the spread of sludge by ocean currents poses a danger to people. Since it is not clear that sludge dumped on the ocean bottom, far from coasts, would endanger people, the bans should be revised to apply only to coastal waters. Each of the following, if true, supports the conclusion that the bans on ocean dumping should be revised EXCEPT:A.
The slow-moving water near the ocean bottom mixes so slowly with water closer to the surface that sludge dumped on the ocean bottom would be decomposed by bacteria before currents could bring it to the surface.
B.
Many locations on the ocean bottom far from coasts are geologically stable, and unlikely to be disrupted by earthquakes or volcanic eruptions.
C.
Deep-sea marine plants and animals in the human food chain live at depths far above the ocean bottom.
D.
Dumping large amounts of sludge would have an unknown effect on organisms that live on the ocean bottom.
E.
The technology exists to lower sewage sludge to ocean-bottom dump sites without contaminating waters closer to the surface.
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【单选题】关于成熟卵泡,下列哪项错误?
A.
很难得,一生中约只有 400 个左右
B.
其余卵泡易退化,成熟卵泡不退化
C.
其颗粒层比次级卵泡的颗粒层薄
D.
卵细胞可以是初级卵母细胞,也可以是次级卵母细胞
E.
突向卵巢的表面处与卵巢被膜一起形成卵泡小斑
【单选题】关于成熟卵泡下列哪项是错误的:
A.
见于月经周期的第15~28天
B.
突向卵巢表面
C.
卵泡腔大
D.
卵泡细胞不再分裂增生
E.
排卵前次级卵母细胞已进入第二次成熟分裂
【单选题】关于成熟卵泡,下列哪一项错误
A.
很难得，一生中只有400个左右
B.
成熟卵泡一旦形成，卵细胞就完成了第1次减数分裂
C.
其颗粒层比次级卵泡的颗粒层薄
D.
卵细胞可以是初级卵母细胞，也可以是次级卵母细胞
E.
突向卵巢的表面
【单选题】关于成熟卵泡,下列哪项错误
A.
很难得,一生中约只有 400 个左右
B.
其余卵泡易退化,成熟卵泡不退化
C.
其颗粒层比次级卵泡的颗粒层薄
D.
卵细胞可以是初级卵母细胞,也可以是次级卵母细胞
【简答题】随机抽样调查的组织形式有哪些?
【单选题】关于成熟卵泡的描述,下列哪项是错误的
A.
在FSH和LH作用下，由次级卵泡发育而来
B.
卵泡体积显著增大，隆突于卵巢表面
C.
颗粒细胞停止增殖，颗粒层变薄
D.
初级卵母细胞在排卵前36～48h完成第一次减数分裂
E.
次级卵母细胞停留于第二次减数分裂的前期
【单选题】某人要从深圳搭乘汽车去哈尔滨,他希望选择一条线路,经过转乘,使得车费最少。此问题可以转化为( )。
A.
最大流问题求解
B.
最短路问题求解
C.
最小树问题求解
D.
指派问题求解
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