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【单选题】
DR的全称是()
A.
计算机扫描摄影
B.
计算机X线摄影
C.
计算机体层摄影
D.
直接X线摄影
E.
计算机横断面体层扫描
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参考答案:
举一反三
【单选题】What is Omni-directional antenna?
A.
An antenna which is capable of line-of-sight communication with a satellite without requiring any pointing
B.
Generally it is used on an INMARSAT-M MES
C.
Generally it is used on an INMARSAT-F MES
D.
This is a kind of directional antenna
【单选题】原子吸收光谱仪中,产生共振发射线和共振吸收线的部件是
A.
光源和原子化器
B.
原子化器和光源
C.
光源和单色器
D.
原子化器和单色器
【单选题】A parabolic dish antenna is a(n) _________ antenna.
A.
unidirectional
B.
horn
C.
omnidirectional
D.
bidirectional
【单选题】What might be the obstacles for transmitting antenna and receiver antenna to get connected?
A.
Deep oceans
B.
High mountains.
C.
Long rivers.
D.
Huts.
【简答题】天线色素(antenna pigment)
【单选题】叶片泵同样存在着泄漏问题,特别是端面的泄漏。为了减少端面泄漏,采取的间隙自动补偿措施是(   )。
A.
浮动侧板
B.
浮动配油盘
C.
浮动轴套
D.
通过胶圈的压力
【单选题】Antenna gain is obtained by...? ()
A.
A power amplifier in the antenna system
B.
Concentration of radiation
C.
Highly effective antenna cables
D.
Good SWR (Standing Wave Ratio)
E.
A spherical radiation pattern
【单选题】正常心室功能曲线不出现降支的原因是()
A.
心肌的静息张力较小
B.
心肌的伸展性较大
C.
心肌的伸展性较小
D.
心肌的贮备能量较好
E.
心肌收缩为潜在能力较大
【单选题】What is omni-directional antenna?
A.
An antenna which is capable of line-of-sight communication with a satellite without requiring any pointing.
B.
Generally it is used on an Inmarsat-B MES.
C.
Generally it is used on an Inmarsat-F MES.
D.
This is a kind of directional antenna.
【单选题】正常心功能曲线不出现明显下降支的原因为
A.
心室肌的伸展性小
B.
心肌初长度始终与前负荷呈平行关系
C.
心肌的静息张力小
D.
心肌的主动张力大
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