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如果不存在固定成本，边际贡献就等于息税前利润，息税前利润变动率就等于产销业务量变动率。 ( )
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My grandfather used to have a beautiful gold pocket watch．He wore it on a fine gold chain across the front of his waistcoat，and when 1 was small he promised to leave it to me in his will．“When I’m gone，”he said，“this is going to be yours．”Unfommately that will never happen now．About three months ago，my grandfather came up to London to visit US．The first Sunday morningafter he arrived，my youngest son said he wanted to go to the park．“We’11 do better than that．”said my grandfather, "we’ll go and feed the pigeons in Trafalgar Square." So off they went. Theygot home about teatime and my grandfather was looking very upset. "My watch," he said, "it’sgone. Someone must have stolen it while we were feeding the pigeons.\ Where do they live They live in______
吸光度读数在0.15～0.7范围内，测量较准确。
以下程序的输出结果是( )。 #include＜iostream.h＞ void func(char**m) ++m： cout＜＜*m＜＜end1； void main() static char*a[]="MORNING","AFTERTOON","EVENING"； char**n： n=a； func(n)；
在酸碱滴定法中，强酸和强碱都可以做滴定剂。
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