().
参考答案：-2eπ
解析：
本题考查了一元函数在一点处的一阶导数的知识点．
由，
故．
--- What has become of the spaceship?
-- It landed ______.
A．safely but broken
B．safe but has broken
C．safely but was broken
D．safe but broken
属于利尿剂的是（）
A.cef-
B.-conazole
C.-azepam
D.-dipine
E.-semide
().
，
．
().，．