下列各图所示变化中,属于物理变化的是[ ]
A.带火星的木条复燃
B.对着干燥玻璃呼气
C.木炭在O2中燃烧
D.紫色石蕊试液中通入CO2
答案:B
It takes________money to build a family.It takes love,patience and trust as well. [ ]
A . other than
B. less than
C. rather than
D. more than
按目前的技术水平,下面的设备中()是多媒体计算机必需的。
A.打印机
B.声卡
C.CD—ROM
D.数码像机