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【单选题】
收集菌体最适合采用 设备。A.
超滤
B.
反渗透膜分离
C.
真空转筒过滤机
D.
管式离心机
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【简答题】下图给出了两种LED数码管的内部结构原理图，其中图(a)为共___【23】____极LED数码管，图(b)为共___【24】____极LED数码管。
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【简答题】设计一个4*4矩阵键盘,双数码管显示,其键值为“00~15”。按下按键后,数码管显示相应的键值。 要求:用行扫描法识别键盘,且键盘要求有去除抖动功能 。
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