面板化后，制造过程根据客户的规格进行基板和材料准备。在制作刚性 PCB 时，典型的基板是 FR-4，一种玻璃增强环氧树脂层压板，具有优异的电绝缘性能、机械强度和阻燃性能。然后，这种基材上涂覆一层导电层，通常是一张非常薄的铜箔。

The Mega Millions jackpot is an estimated $198 million with a cash option of $89.3 million for the Friday, August 15, 2025 drawing. No one won the Tuesday, August 12 drawing, leading to the jackpot ...

Catch all the updates from the second day of the IPL 2025 Mega Auction. To follow the live tracker, click here. Your favourite Dinesh Karthik is back and he will answer all your questions around the ...

One of the largest jackpots ever will be up for grabs on Saturday. The Powerball jackpot has surged to an estimated $1.8 billion for Saturday night's drawing after no tickets matched Wednesday's $1.4 ...