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【判断题】
经营第二类医疗器械的企业都需要持有《医疗器械经营许可证》。()A.
正确
B.
错误
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举一反三
【简答题】In them, there are tangible products can be creation such as automobile or a computer. Among organizations that do not create physical products, often when services are performed, intangible goods are...
【单选题】there are intangible benefits beyond a rise in the share price.
A.
visible
B.
invisible
C.
abstract
D.
specific
【单选题】How many intangible cultural heritages are there in China by the end of 2018.
A.
40
B.
41
C.
50
D.
51
【简答题】试求题4．25图所示周期信号的频谱函数。图(b)中冲激函数的强度均为1。
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