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【单选题】
对称振子天线馈线的任务是【】
A.
平衡和匹配
B.
对称和平
C.
对称和匹配
D.
接触和平
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【单选题】液体在管道中存在两种流动状态, 时惯性力起主导作用。
A.
湍流
B.
粘滞流
C.
层流
【单选题】The coat the young man was wearing ______.
A.
was new and in good shape
B.
was cut out very well
C.
had been used for a lot of years
D.
fitted him well
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A.
) *pw.year = 198O
B.
) w.year=1980
C.
) pw->year=1980
D.
) w.s.year=1980
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A.
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B.
粘滞流
C.
层流
D.
紊流
【单选题】有以下定义和语句: struct workers {int num;char name[20];char C; struct {int day;int month;int year;)S; }; struct workers w,*pw; pw=&w; 能给w中year成员赋1980的语句是( )。
A.
*pw.year=1980;
B.
w.year=1980;
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pw->year=1980
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【单选题】液体在管道中存在两种流动状态, 时惯性力起主导作用。
A.
层流
B.
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C.
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