皮皮学，免费搜题
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【单选题】
线定位工具的形状是：A.
同心圆
B.
两个方框
C.
一个方框，其中一条边有箭头
D.
一个圆
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【单选题】What is the central topic of the second paragraph?
A.
Influences of economics.
B.
Importance of knowing economics.
C.
Applications of economics.
D.
Scope of economic studies.
【多选题】Microwave engineering pertains to the study and design of microwave circuits, components, and systems. Fundamental principles are applied to analysis, design and measurement techniques in this field. ...
A.
Design of microwave circuits, components, and systems. 【设计微波电路、元件及系统】
B.
Fundamental principles are applied to analysis, design and measurement techniques in this field. 【微波原理、应用、测试技术等】
C.
低频电子线路（ low frequency Electronic Circuit)
D.
antennas , radar , transmission lines , space based systems ( remote sensing ), measurements, microwave radiation hazards and safety measures. 【天线、雷达、传输线、遥感/遥测 等】
【简答题】What is the Central Idea?
【简答题】At low frequencies, we cannot detect ____________________ because of stereo redundancy.
【简答题】What is the central topic of the text?
【单选题】{ To draw the small-signal ac equivalent circuit for a common-emitter amplifier, we can treat the capacitors as ( ). (We assume that the coupling and bypass capacitors are chosen to have very low ac i...
A.
an inductor
B.
a resistor
C.
open circuits
D.
short circuits
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