【简答题】只能在空气中硬化的胶凝材料,称为( )。
【简答题】The first snow of this winter made most kids excited. But Elton was not happy. He was an outside boy. He loved swimming, boating, and riding his bike in summer. When it snowed, he was always sad. Afte...
【简答题】触发时刻,有两个选项: 和 ,以表示触发器是在激活它的语句之后或之前触发。
【单选题】The old engineer ’ s eyes still shone bright in the wrinkled brown face and his step as he came across the room was ________ .
【简答题】只能在空气中硬化,也只能在空气中保持或发展其强度的胶凝材料被称为____性胶凝材料。
【单选题】电气控制系统中,电梯只能下行,不能上行的不可能原因是()。
【单选题】只能在空气中硬化,而不能在水中硬化的一类无机胶凝材料,称为( )。
【单选题】只能在空气中硬化材料的称为( )胶凝材料,如石膏、石灰。
【单选题】—Whose ball is this? —It's _______. [ ]
【单选题】对二级地基上的6层住宅楼,按地质情况可能采用桩基础,结合上部荷载,桩型宜选φ400或φ500mm预应力管桩,以第5层中密细砂为桩端持力层,桩长选20m,则详勘时,勘探点深度应如何选择?