为促进消费者的购买行为,应当注意产品创新活动与外界环境的()。
A.差异性
B.多样性
C.适应性
D.特殊性
参考答案:C
Do tell me the ways you think of _____ the problem as soon as possible. [ ]
A. to solve
B. solving
C. solve
D. being solved
有一个高压电容器,电容为1000pF,在1000V电压下漏电流为50μA,求当频率为50Hz时,该电容器损耗系数是多少?