【单选题】I know him very well. He’s sure to _____ his promise
【单选题】— This returned scientist has become one of the top experts in his field. — Yes, I know him very well. He once _____ in South America with wild animals for eight years. [ ]
【简答题】为了增加学生的国防知识,阳湖中学九(2)班同学到东海舰队参观某型号潜水艇。潜水艇的艇壳是用高强度的特种钢板制造,最大下潜深度可达350m。潜水艇的总体积为1.5×10 3 m 3 ,艇内两侧有水舱,潜水艇截面如图所示。通过向水舱中充水或从水舱中向外排水来改变潜水艇的自重,从而使其下沉或上浮(海水密度为1. 03× 10 3 kg/m 3 ,g取10N/kg)。 (1)水舱未充海水时,潜水艇总重量为...
【单选题】将截面积相等、长度相等的铜棒和铁棒串联,两端加上电压U。已知铜的电阻率比铁的电阻率小,则:
【单选题】将截面积相等、长度相等的铜棒与铁棒串联,两端加上电压U,已知铜的电阻率比铁的电阻率小。则
【单选题】I know him very well, because we _______ friends for ages.
【单选题】I know him very well because we ______ friends for ages.