单项选择题

A．2.
B．3.
C．6.
D．9.
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______measures the annual energy output per square meter of area swept by the turbine blades as they rotate.
单项选择题
A．Interviewing a job applicant.B．Filling a vacancy.C．Looking for a tour guide.D．Applying for a job.
A．Interviewing a job applicant.
B．Filling a vacancy.
C．Looking for a tour guide.
D．Applying for a job.
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