如果水果店里运苹果m千克,比梨的3倍多x千克,梨的千克数可表示为[ ]
A. m÷3-x
B.(m-x)÷3
C.(m+x)÷3
答案:B
— Look, what have you done?
— Sorry. I think if I _____ another chance, I'll do it better. [ ]
A. give
B. will be given
C. will give
D. am given
下列不属于稳压管的主要参数的是()。
A.稳定电压
B.动态电阻
C.最大耗散功率
D.恒定电流