求．其中L为圆周，经是x2+y2+z2=1与x+y+z=0的交线．
参考答案：
解析：利用对称性：
合格品硫酸铵的氮含量在什么之间？
They looked very excited they had won the football game.
A． even though
B． even if
C． though
D． as if
