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【单选题】
正弦交流电的三要素是( )、角频率和初相位。A.
小值
B.
平均值
C.
大值
D.
代数值
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举一反三
【简答题】Athletic shoes. You work in them. You play in them. You want them to look and feel great. New Speedies are the right shoes for you. They're ______ (light) other athletic shoes. And that means you'll b...
【单选题】My mother asked me to repeat ________ phone number ________ second time so that she could write it down.
A.
the; a
B.
a; a
C.
a; the
D.
the; the
【单选题】They're motionless , waiting for the performance to start.
A.
melodious
B.
restless
C.
relaxed
D.
not moving
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