积分回馈业务价值是指可用于积分回馈的礼品/服务价值,包括()及()礼品/服务的价值。
A.非话费类;
B.实物类;
C.话费类;
D.非实物类
参考答案:A, C
_______ seems strange to us is ________ the clever boy failed in the exam.
A.It; that
B.What; what
C.It; how
D.What; that
乙炔发生器的搅拌形式是多层耙齿搅拌靠埚轮埚杆减速机实现,采取皮带连接。