_________(56)A.collecting B.selling C.buying D. u

Dr. Jason decided to help his students by______.A．collecting used textbooksB．writing a con

_________(56)A.meeting B.conferenceC.gathering D.

_________(56)A.ingredient B.componentC.portion D.

U盘属于____。A.只读存储器B.光存储器C.外存储器D.内存储器

大船锚链节与节之间常用的连接方法是_______。A.连接链环B.U型卸扣C.转环D.转环或U型卸

下列各类计算机存储器中 断电后其中信息会丢失的是_____。A.ROMB.RAMC.U盘D.硬盘