以下的营销哲学中属现代营销观念的有( )。
A．产品观念
B．市场营销观念
C．生产观念
D．推销观念
参考答案：B
It is easy to be thankful for the good things, ________ a life of rich fulfillment comes to those who are also thankful for the setbacks. [ ]
A. that
B. which
C. while
D. when
常用的一维码的码制包括：______、39码、交叉25码、UPC 码、 128码、93码及______等。
