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【单选题】
X线成像的基础是（）A.
穿透性
B.
荧光效应
C.
感光效应
D.
电离效应
E.
生物效应
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皮皮学刷刷变学霸
举一反三
【单选题】The last sentence in the first paragraph, 'Mayoral knew no one who had been close to a healthy gray whale and lived' means ______.
A.
nobody had ever approached a living whale
B.
among his friends no one saw any whale that was still alive
C.
no one he knew had ever touched a living whale
D.
whales would cat up anyone they catch without exception
【简答题】在关系模型中,现实世界的实体以及实体间的各种联系均用单一的结构类型________来表示。
【单选题】The ______ occurs in the first eight weeks of pregnancy, though no one understands cause of the disease.
A.
version
B.
anxiety
C.
homesickness
D.
defect
【单选题】The last sentence in the first paragraph, 'Mayoral knew no one who had been close to a healthy gray whale and lived' means ______.
A.
nobody had ever approached a living whale
B.
among his friends no one saw any whale that was still alive
C.
no one he knew had ever touched a living whale
D.
whales would eat up anyone they catch without exception
【单选题】In the first ,no one got two-thirds of the vote. So the voting continued.
A.
ball
B.
ballet
C.
ballot
D.
bald
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