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【单选题】
多态的表现形式有(A)A.
重写
B.
抽象
C.
继承
D.
封装
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举一反三
【单选题】What did P and S waves help scientists discover about the layers of the earth?
A.
How deep they are.
B.
Where earthquakes form.
C.
How hot they are.
D.
What purpose they serve.
【单选题】Did you know __ over there? [ ]
A.
what did happen
B.
what happened
C.
what is happening
【多选题】题 根据《增值税暂行条例》规定，下列关于增值税专用发票开具时限的表述中，正确的有（ ）。
A.
采取交款提货结算方式的，增值税专用发票开具时限为收到货款的当天
B.
采取分期付款结算方式的，增值税专用发票开具时限为货物发出的当天
C.
采取托收承付结算方式的，增值税专用发票开具时限为货物发出的当天
D.
采取委托银行收款结算方式的，增值税专用发票开具时限为货物发出的当天
【单选题】What did the author constantly fight against while doing her Ph.D. and post-doctoral research?
A.
Lack of confidence in succeeding in space science.
B.
Unfair accusations from both inside and outside her circle.
C.
Peoples stereotyped attitude towards female scientists.
D.
Widespread misconceptions about nature and nurture.
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