Webpoj 3904. 题意：给出n个数，问有多少组 (a,b,c,d)公约数为1。. 题解：有两种思路，一个是mobius反演，一种是容斥。. 先介绍一下容斥的思路：我们考虑该问题的逆问题，求多 … WebMMBT3904. 40 V, 200 mA NPN switching transistor. NPN switching transistor in a small SOT23 (SC-70) Surface-Mounted Device (SMD) plastic package. PNP complement: …

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PZT3904 onsemi Discrete Semiconductor Products

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