单选题设α＞0是常数，则f(c)在(0，π)

单选题设是可逆矩阵，B是三阶矩阵，满足则|B|=______

单选题设，则=______.A．1B．C．D．e-1

单选题设函数f(u)连续，区域D=(x，y)|x2+y2≤2y，则等于

单选题设f(x)为连续函数，

单选题设α＞0是常数，则f(x)在(0，π)

单选题设β，α 1 ，α 2 线性相关，β，α 2 ，α 3 线性无关，则______

单选题下列命题中正确的是A．设f(x)在(-∞，+∞)为偶函数且在[0，+∞)可导，则f(x)在(-∞，+∞)可导．B．设f(x)在(-∞，+∞)为奇函数且在[0，+∞)可导，则f(x)在(-∞，+∞)可导．C．设f(x)dx=0，则D．设x0∈(a，b)，f(x)在[a，b]除x0外连续，x0是f(x)的第一类间断点，则f(x)在[a，b]仍存在原函数．

单选题German Chancellor Angela Merkel won over German voters in the Federal Election on Sept. 27. Can she now be won over by a French charm offensive (1) at repairing the relationship that was once at the heart of Europe? That's the question being asked in Paris, (2) top government officials are (3) talking about their desire to rekindle closer ties (4) their neighbors across the Rhine. (5) the end of World War II the Franco-German relationship has been the motor of European integration, the (6) force behind the creation of the European Union and, more recently, the introduction of the euro. But the ardor has (7) in this decade, particularly under Merkel, who has regularly struggled to (8) her irritation with French President Nicolas Sarkozy's grandstanding. Sarkozy, (9) , has often been impatient with what he (10) Merkel's lack of resolve. The sometimes (11) personal rapport is a long way from the public shows of affection their predecessors staged, particularly Helmut Kohl and FranCois Mitterrand, who movingly held (12) in 1984 in a Verdun cemetery. There's been tension on (13) , too. Charles Grant, director of the London-based think tank Centre for European Reform, points out that France and Germany have been (14) on issues from how best to reflate their economies during the economic (15) to the smartest strategies for dealing with Russia. But influential movers in France are now (16) to put the relationship back on a friendlier footing. In a recent paper French think tank Institute Montaigne (17) an ambitious agenda for the two nations, (18) that a new impetus is needed if Europe's voice is to be heard in a world (19) of big new players, such as Brazil and India, and at a time when President Obama seems fax more (20) with China and the rest of Asia than with America's traditional allies in Europe.

单选题设A是n阶矩阵，先交换A的第i列与第j列，然后再交换第i行和第j行，得到的矩阵记为B，则下列五个关系①|A|=|B|②r(A)=r(B)③A≌B④A～B⑤AB中正确的有

单选题买卖兵器，珍异等小件物品使用的较短契券称为( )。 A．傅 B．别 C．质 D．剂