【简答题】Why were cracks in old houses not a big concern? A) Because indoor cleanliness was not emphasized. B) Because energy used to be inexpensive. C) Because environmental protection was given top priority....
【单选题】立体分为平面和曲面两种,表面中含有曲面的立体称为( )
【单选题】立体分为平面和曲面两种,表面中包含有曲面的立体称为( )
【单选题】如图3所示,测设出直角∠BOD′后,用经纬仪精确地检测其角值为89°59′30′′,并知OD′=150m,问D′点在D′O的垂直方向上改动多少距离才能使∠BOD为90°? 图3 主点调整
【判断题】西方现代文论,更加重视文学作品的内在构成规律。
【简答题】在高速路上行驶时,轮胎气压高些好还是低些好?为什么?若在松软的沙土路面或雪面上又如何?