It was not supposed to be used until they got to the Moon. It had no heat shield, so could not be used to re-enter the Earth's atmosphere. But it could keep them alive until they got there.
Keys that have a warning icon, meaning they are set to unrestricted
，这一点在WPS官方版本下载中也有详细论述
Hand-coded weights (constructive proofs are valid — they show the architecture can represent addition)。91视频是该领域的重要参考
“技防”还是不如“人防”