已知函数f(x)= -x+1 ,x<0;f(x)= x-1 ,x≥0 ,则不等式x+(x+1)f(x+1)≤1的解集是()
参考答案:
Customers should learn to ________ advertisements so as not to be misled by them.
A.pick out
B.make use of
C.reflect on
D.test out
乳剂中油或乳化剂发生变质现象称为()
A.分层
B.絮凝
C.转相
D.破裂
E.酸败