核心产品是指向顾客提供的基本效用与利益。
参考答案:对
Bob has learned a lot from his _______ of working in different gyms and is now an expert on all kinds of _______.
A.experience; equipment
B.experience; equipments
C.experiences; equipment
D.experiences; equipments
除颤首次能量给予(),最大量可增至()。