【单选题】Why should we elect him _________mayor? I mean last year he was elected as _________ member of the Congress and he has failed to keep any promise he made during the election.
【单选题】市场上许多产品由于( ),形成一种习惯价格或便利价格,消费者习惯于按此价格购买,对此类产品,任何企业要进入市场,必须依照习惯价格定价,这就是习惯定价。
【单选题】We elected him ________ manager of the department.
【单选题】He was so helpful that we ____ him as direct. [ ]
【单选题】金属钾与金属钠的金属性相近,且钾比钠略强。当利用金属钾与钠盐共熔制金属钠时,发现钾与钠的共熔体难以分离。如调整温度到一定程度,则可用金属钠与氯化钾反应,制出金属钾。下面是四种物质的熔、沸点: 物质 K Na KCl NaCl 熔点/℃ 63.65 97.8 770 801 沸点/℃ 774 882.9 1500(升华) 1413 根据平衡移动原理可推知,用金属钠与氯化钾反应制金属钾的适宜温度是……...
【简答题】We elected him president.
【单选题】钾的金属活动性比钠强,根本原因是 [ ]
【单选题】We elected him ___ monitor of our class, and he gave ___ to everyone.
B.
/, his respects and help
C.
the, respect and honors
【简答题】金属钠与金属钾的金属性相近,且钾比钠略强。当利用金属钾与钠盐共熔制金属钠时,钾与钠的共熔体难以分离。反之,如调整到一定温度,可用金属钠与氯化钾在熔融时发生反应制取金属钾。下面列出四种物质的熔沸点: K Na KCl NaCl 熔点/℃ 63.6 97.8 770 801 沸点/℃ 774 882.9 1 500 1 413 试完成下列问题:(1)写出发生反应的化学方程式。 (2)根据上列...