A:bought; has had
B:bought; has
C:has bought; has had
D:has bought; had
下面所列动物的特征中能够增大压强的是( )
服装店老板买进500双袜子,每双进价3元,原定零售价是4元.因为太贵,没人买,老板决定按零售价八折出售,卖了60%,剩下的又按原零售价的七折售完.请你算一下,卖完着500双袜子时( )
下列物质,不能由金属单质和盐酸直接反应生成的是( )