皮皮学，免费搜题
登录
搜题
【单选题】
下列设备组中,完全属于输出设备的一组是A.
激光打印机、移动硬盘、鼠标器
B.
CPU、键盘、显示器
C.
SRAM内存条、CD－ROM驱动器、扫描仪
D.
USB优盘、内存储器、硬盘
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【多选题】What is an intron?
A.
Most protein-coding eukaryotic genes, in contrast, have their coding sequences interrupted by long, noncoding, intervening sequences called introns.
B.
The scattered pieces of coding sequence—called expressed sequences or exons—are usually shorter than the introns, and they often represent only a small fraction of the total length of the gene.
C.
Introns range in length from a single nucleotide to more than 10,000 nucleotides.
D.
Some protein-coding eukaryotic genes lack introns altogether, some have only a few, but most have many.