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【单选题】
频率f的单位是( )。A.
HZ
B.
rad/s
C.
rad
D.
HZ/s
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皮皮学刷刷变学霸
举一反三
【单选题】Is it in that factory ___ Red Flag cars are made?
A.
a. in which
B.
b. where
C.
c. that
D.
d. which
【单选题】Is it in that factory this kind of cat is made?
A.
in which
B.
where
C.
that
D.
which
【简答题】Is it that factory _____ this car is produced?