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【单选题】
关于相机光学镜头的说法中，下列哪个说法是错误的？A.
镜头将光线聚焦于像平面
B.
穿过镜头光学中心的光线不会改变方向
C.
与光轴平行的光线聚于焦点
D.
在焦距远大于物距时，成像模型可以近似为针孔成像
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【简答题】标记用于定义表格内的表头单元格,在此单元格中的文字有 效果 。
【单选题】Which of the following is NOT among the claims that are made accusing the author's research?
A.
The author does his research only for his own career advancement.
B.
The author's research is driven by sadistic impulses.
C.
The author's research is of no significance.
D.
The author can make use of computer simulation.
【简答题】标记用于定义表格内的表头单元格,在此单元格中的文字有 效果 。
【单选题】Which of the following is NOT among the claims that are made accusing the author’s research? ____
A.
the author does his research only for his own career advancement.
B.
The author’s research is driven by sadistic impulses.
C.
The author’s research is of no significance.
D.
The author can make use of computer simulation.
【单选题】After a number of people living close to one of South's stores became seriously ill, the source of the illness was traced back to meat the customers had purchased from South. Legal proceedings were co...
A.
2 and 3 only
B.
3 and 4 only
C.
2, 3 and 4 only
D.
1, 2 , 3 and 4
【简答题】标记用于定义表格内的表头单元格,在此单元格中的文字有 效果 。
【多选题】有关女性生殖系统特点的说法中，正确的是
A.
女子的腹肌、盆底肌和横膈膜保持了腹腔、盆腔内有一定的压力
B.
女性子宫在骨盆中的位置主要靠子宫圆韧带、腹腔和盆腔的压力来维持
C.
如果女性的盆底肌松弛可能导致子宫位置发生改变，从而可能影响妇科疾病和日后生育
D.
女性经常从高处跳下、在僵硬的地面跑跳，有可能由于过分震动，影响女性盆腔脏器的正常功能
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