【简答题】(10分)为了合理利用化学能,确保安全生产,化工设计需要充分考虑化学反应的反应热,并采取相应措施。化学反应的反应热通常用实验进行测定,也可进行理论推算。 (1) 实验测得,5g甲醇在氧气中充分燃烧生成二氧化碳气体和液态水时释放出113.5kJ的热量,则甲醇的燃烧热ΔH= 。 (2)今有如下两个热化学方程式:则a b(填>, =' ,' H 2 (g)+ O 2 (g) = H 2 O(g) ΔH...
【单选题】购买劳动力的资本之所以属于流动资本是因为( )。
【单选题】以对象群体的平均水平或常模为参照点,确定评价对象在群体的相对位置的评价方式为
【简答题】To many people, love is 1____ in their life. In such hard times as the Second World War, love, even if not openly expressed, sustained a person through 2)_____ more than anything else. After the night...
【判断题】以评价对象的平均水平为参照点,确定评价对象在群体中的相对位置的评价方法称为常模参照评价。
【单选题】Drexler acquired an item of plant on 1 October 20X2 at a cost of $500,000. It has an expected life of five years (straight-line depreciation) and an estimated residual value of10%of its historical cos...
A.
historical cost and current cost: $ 320,000 and $600,000
B.
historical cost and current cost: $ 320,000 and $384,000
C.
historical cost and current cost: $ 300,000 and $600,000
D.
historical cost and current cost: $ 320,000 and $300,000
【简答题】为了合理利用化学能,确保安全生产,化工设计需要充分考虑化学反应的反应热,并采取相应措施。化学反应的反应热通常用实验进行测定,也可进行理论推算。 (1)实验测得,5g甲醇在氧气中充分燃烧生成二氧化碳气体和液态水时释放出113.5kJ的热量,试写出甲醇燃烧的热化学方程式: ______________________ 。 (2)已知:Na 2 O 2 (s)+CO 2 (g)=Na 2 CO 3 (s...
【简答题】It is well known that if one wants to maximize the life income through a college education, he/she needs to 1) _ and 2) _. However, this myth is denied since it lacks supporting 3)_. For years evidenc...