柏林的秋天，晴朗的下午，从勃兰登堡门沿着菩提树下大街往东漫步，微风习习，树影婆娑，洪堡大学、柏林国家歌剧院、德国历史博物馆……还有一座座崭新的建筑，眼前是一幅德国历史和现代交替的图景。
After a bit of poking, I found what looked to be a textbook quartz crystal resonant curve, but centered at 20 MHz rather than 10. This suggests there’s a divide-by-two in the driver circuit, perhaps to improve the duty cycle to a more perfect 50%. But more importantly, it suggests that neither the crystal itself, nor the electrical connections between it and the package (since I was probing at the package contacts and not the surface of the quartz), were the source of the failure.
，这一点在wps中也有详细论述
第四十九条 承运人应当妥善、谨慎地接收、装载、搬移、积载、运输、保管、照料、卸载和交付所运货物。，更多细节参见谷歌
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