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【判断题】
变频调速的调速范围宽,精度高,能实现无极调速,需要专用的变频电源A.
正确
B.
错误
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皮皮学刷刷变学霸
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【简答题】Why do you think guests make hotel reservations before they travel? A. Because they want to secure a room. B. The hotel charges higher when you do not reserve. C. People who make a reservation ge...
【单选题】Which of following is the organ for hearing?
A.
macula sacculi and macula utriculi
B.
spiral organ
C.
cochlear duct
D.
spiral membrane
E.
None of above
【单选题】Which organ helps parrots to imitate different sounds?
A.
tongue
B.
trachea
C.
vocal cords
【单选题】The heart is an important organ of circulation ______ function is to pump. blood to all parts of the body.
A.
which
B.
whose
C.
of it
D.
its
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