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【多选题】
下列关于边际效用与总效用,说法正确的是( )A.
总效用曲线达到顶点时， 边际效用为零
B.
如果边际效用递减，则总效用下降
C.
边际效用大于零，总效用上升
D.
边际效用小于零，总效用下降
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反馈参考答案：
举一反三
【单选题】SSRIs中文全称是( )
A.
选择性5~羟色胺再摄取抑制剂
B.
选择性中枢多巴胺D2再摄取抑制剂
C.
选择性肾上腺素再摄取抑制剂
D.
选择性胆碱再摄取抑制剂
E.
选择性组胺再摄取抑制剂
【单选题】甘薯种植多年后易积累病毒而导致品种退化。目前生产上采用茎尖分生组织离体培养的方法快速繁殖脱毒的种苗，以保证该品种的品质和产量水平。这种通过分生组织离体培养获得种苗的过程涉及细胞的 ①有丝分裂 ②分化 ③减数分裂 ④全能性 [ ]
A.
①②③
B.
②③④
C.
①③④
D.
①②④
【简答题】What is the theme of the whole work?
【简答题】What is the theme of the poem? Passage 2
【单选题】What is the theme of the poem Wenlock Edge?
A.
It shows the passage of time and the smallness of human being
B.
It shows the stillness of nature
C.
It laments about the death of youth
D.
It shows a poet contemplating the issue of life and death
【多选题】甘薯种植多年后易积累病毒而导致品种退化。目前生产上采用茎尖分生组织离体培养的方法快速繁殖脱毒的种苗,以保证该品种的品质和产量水平。这种通过分生组织离体培养获得种苗的过程涉及细胞的
A.
有丝分裂
B.
分化
C.
减数分裂
D.
全能性
【单选题】What is the theme of the story?
A.
The misery of the factory workers.
B.
How to survive in a harsh environment.
C.
Generation gap between the father and the son.
D.
Love between the father and the son.
【单选题】What is the theme of the essay?
A.
he is the religious leader of the black civil rights
B.
he was visionary Instead it gives a much broder canvas,and reveals his vision of the future of the entire humanity. he wrote and spoke to wake up peple, inspire them, urge and encourage them to achieve world peace.
C.
he is good at public speaking
D.
he died for freedom
【单选题】甘薯种植多年后易积累病毒而导致品种退化。目前生产上采用茎尖分生组织离体培养的方法快速繁殖脱毒的种苗，以保证该品种的品质和产量水平。这种通过分生组织离体培养获得种苗的过程不涉及细胞的 [ ]
A.
有丝分裂
B.
分化
C.
减数分裂
D.
全能性
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