the planet is so close to its star that any water would be turned to _____ (蒸汽).
两平面立体相交,由于立体都是封闭的,故相贯线都是封闭的空间折线。
本次作业共五题,每题各20分。
it is a truth universally acknowledged that a single man in possession of a good fortune must be in want of a wife. mr. darcy was such a single man. elizabeth was shocked when she realized darcy’s _____ (巨大的) wealth.
两曲面立体相交时,相贯线只能是平面曲线或空间曲线。
at the initial stage of beijing opera, yuju exerted considerable influence on it.