【单选题】The sentence 'Had he known her address, he would have written to her' means that
A.
he has known her address.
C.
he didn't know her address.
D.
he asked for her address.
【单选题】用GHz来衡量计算机的性能,它指的是()。
【单选题】“有物不知其数”问题的解答方法不包括?()
【简答题】遂宁市大英县境内的卓筒井是手工制盐的活化石,被誉为“中国古代第五大发明”、“世界石油钻井之父”,不仅是古代劳动人民勤劳、智慧的象征,也造福了千秋万代.其工艺流程包括下面五个步骤: 请结合所学化学知识,回答下列问题: (1)第②步汲出的卤水浑浊,浓度一般在7~10度(即溶质质量分数为7%~10%,下同),这样的卤水咸度低,耗燃料,成本高,为了把卤水浓度提高18~20度,就产生了“晒卤”这一环节.在“...
【判断题】投标定价是卖方引导买方竞争成交的一种定价方法( )。
【单选题】The sentence "Had he known her address, he would have written to her" means that
A.
he has konown her address
C.
he didn't know her address
D.
he asked for her address
【判断题】投标定价是卖方引导买方竞争成交的一种定价方法。()
【判断题】一般应使轴颈的耐磨性和硬度大于轴瓦。()
【简答题】在一片农,长有很多杂草,还有粘虫、青蛙、蛇等动物活动,某中学生物兴趣小组对这一农田进行研究,根据所学知识回答问题。 (1)该农,所有生物的种群的集合称为____________,其物种数目的多少叫________。 (2)若要用同样方法调查该农的蒲公英的种群密度,取样时关键是要做到__________,取样时常用到的方法是_________和____________。 (3)若农田被弃...