单项选择题
If it is generally acceptable as a medium of exchange then it A.
must be a commodity. B.
must be a precious metal such as gold or silver. C.
is money. D.
all of the above.
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单项选择题
关于鼻旁窦CT扫描一下说法错误的是
A.鼻旁窦扫描多采用冠扫
B.鼻旁窦CT冠状位扫描范围为鼻翼扫至蝶窦后壁
C.轴位扫描可检查鼻骨和鼻咽部
D.扫描基线只有RBL
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单项选择题
According to the passage, children's bedrooms shouldA.be no place for play.B.be near a common areA.C.have no TV sets.D.have a computer for study.
A.be
B.
B.be
C.
C.have
D.
D.have
E.
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