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【简答题】
已知调频信号u FM (t)=6cos[2π×10 7 t+10sin(2π×10 3 t)]V，则该调频信号的中心频率f c 为______Hz，调频指数m f 为______rad，最大频偏△f m 为______Hz，有效频谱带宽BW为______Hz。
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皮皮学刷刷变学霸
举一反三
【单选题】Catherine Chao, Director of Marketing Research, is evaluating consumer acceptance of a new toothpaste package. Her staff reports that 17% of a random sample of 200 households prefers the new package ...
A.
a point estimate
B.
a range estimate
C.
a statistical parameter
D.
an interval estimate
E.
an exact estimate
【简答题】植物根的表皮上有根毛，根毛属于保护组织—表皮的结构。
【单选题】Which of the following is true about quantitative survey research designs?
A.
They have high response rates.
B.
It is easy to collect in-depth data using quantitative research designs.
C.
They facilitate advanced statistical analysis.
D.
They cannot produce precise estimates.
【单选题】________ allow for the statistical control and analysis of external variables.
A.
Quasi-experimental designs
B.
True experimental designs
C.
Statistical designs
D.
Preexperimental designs
E.
One-shot case studies
【单选题】________ allow for the statistical control and analysis of external variables.
A.
Preexperimental designs
B.
True experimental designs
C.
Quasi-experimental designs
D.
Statistical designs
E.
External variable designs
【简答题】起跑技术总共分两个阶段，分别为：（）、( )
【单选题】Large, representative samples are used to collect data that are analyzed with statistical techniques for which of the following types of research designs?
A.
subjective research
B.
exploratory research
C.
conclusive research
D.
observational research
E.
supporting research
【简答题】云消散的主要条件是:( )运动
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