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【单选题】
全国供用电规则规定电网频率变动范围为；电网容量在3000MW以上者，频率允许变动范围为（）.A.
±0.2Hz
B.
±0.5Hz
C.
±0.3Hz
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反馈参考答案：
举一反三
【单选题】PHILOSOPHY : METAPHYSICS ::
A.
zoology : herpetology
B.
pink : red
C.
light : brilliance
D.
bird : penguin
E.
fragrance: nature
【简答题】A．It tastes good. B．It is cheap. C．It is healthy. D．It is convenient.
【单选题】How was the British postal system then?
A.
Cheap but inefficient.
B.
Expensive and good.
C.
Cheap and efficient.
【单选题】---- What do you think of zoology? ---- In my opinion, zoology is ______ botany.
A.
a subject so interesting as
B.
as a interesting subject as
C.
as interesting a subject as
D.
interesting as a subject as
【简答题】动物学( zoology)
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