【多选题】单片机片外总线结构由以下几部分组成( )
【单选题】In the brain, only __________ of the nervous system that provide nutrients, support, and insulation for neurons—express glutamine synthetase.
【多选题】单片机片外总线结构由以下几部分组成 ( )
【多选题】Commonly used reporter genes that induce visually identifiable characteristics usually involve fluorescent and luminescent proteins, including:
A.
the gene that encodes jellyfish green fluorescent protein (GFP), which causes cells that express it to glow green under blue light
B.
the enzyme luciferase, which catalyzes a reaction with luciferin to produce light
C.
the red fluorescent protein from the gene dsRed
E.
coli lacZ gene, which encodes the protein β -galactosidase. This enzyme causes bacteria expressing the gene to appear blue when grown on a medium that contains the substrate analog X-gal
【多选题】下面关于unix的描述正确的是()
C.
使用chmod777可以改变文件访问权限为属主、用户组、其他人都可读可写可执行
D.
使用chmod ugo+rwx abc.c表示改变文件abc.c访问权限为属主、用户组、其他人都可读可写可执行
【单选题】下列说法不正确的有( )
A.
集成温度传感器把热敏晶体管和外围电路、放大器、偏置电路及线性电路制作在同一芯片上,构成一体化的专用集成器件.
B.
集成温度传感器测温范围受半导体材料的极限工作温度限制。
C.
集成温度传感AD590器是把温度的变化转换为线性电压的变化。
D.
数字集成温度传感DS18B20器内部有A/D转换电路,输出为数字信号。
【单选题】维持血糖浓度相对稳定的人体功能基本调节方式是
【单选题】In ______, Theodore Friedmann and Richard Roblin published an important paper in Science [175(4025): 949-955] describing the use of gene therapy. Friedmann and Roblin described how they induced mammal...
【多选题】大气中NO,NO2和O3之间存在着的化学循环是大气光化学反应的基础,下面那些化学反应与之相关。