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【单选题】
颞区硬脑膜外血肿的出血多来自A.
上颌动脉
B.
颞浅动脉
C.
脑膜中动脉
D.
颈外动脉
E.
内眦动脉
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反馈参考答案：
举一反三
【多选题】CTLs are cytotoxic against tumor cells and host cells infected with intracellular pathogens. These cells usually express ____ and destroy infected cells in an antigen-specific manner that is dependent...
A.
CD4
B.
CD8
C.
MHC I
D.
MHC II
【单选题】In the brain, only __________ of the nervous system that provide nutrients, support, and insulation for neurons—express glutamine synthetase.
A.
neurons
B.
astrocytes
C.
stem cells
D.
glial cells
【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
D.
the
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（）
A.
cat用于显示文本文件内容
B.
more用于分页显示程序或者文本
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】Cells that express both CD3 and CD8 are
A.
NKT cells
B.
NK cells
C.
Tc cells
D.
Th cells
E.
Tr cells
【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...
A.
1965
B.
1969
C.
1972
D.
1975
【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。
A.
NO2 + hv→NO + O●
B.
O●+ O2 + M→O3 +M
C.
O3 + NO→NO2 + O2
D.
以上均不是
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