* @param arr 待排序数组
Butterfield was chief of the Federal Aviation Administration (FAA) at the time, and had previously served as White House deputy chief of staff.
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With the crystal out of the way, we see the package has three levels internally: the controller die (containing the oscillator driver, temperature compensation, and output divide-by-two) sits in a cavity at the lowest level, attached via a dark colored adhesive rather than the usual silver-filled epoxy (presumably because the package is not electrically conductive thus there is no point in using an expensive metal filled adhesive to ground the die backside).
Most of that change came from the impact itself. Some of it came from flying impact debris, which gave Dimorphos a little kick in the opposite direction of its motion.