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【简答题】
有一理想变压器,输入交流电压的最大值为 196V ,另有负载电阻接在 20V 直流 电压上,消耗功率为 P ,将它接入该变压器的次级电路中,消耗功率为 P /4 ,则这个变 压器的绕组的匝数比为多少?
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举一反三
【单选题】完善税收制度包括( )。
A.
在全国范围内实现增值税由消费型转为生产型
B.
适当调整消费税征收范围，合理调整部分应税品目税负水平和征缴办法
C.
尽快开征燃油税
D.
改革房地产税收制度，稳步推行物业税并相应增加有关收费
【单选题】The National Party ______.
A.
has started to try to win over the coloured
B.
consists of 80% of Coloured members living in the Western Cape
C.
holds the principles that all races are equal
D.
is an organization which controlled Cape Town
【单选题】Millie has _____free time than Sandy because she has____ work to do than Sandy.
A.
less; more
B.
fewer; more
C.
least; most
D.
fewest; most
【判断题】n Xanthones n have a C6 –C1 –C6 carbon skeleton, which consists of two aromatic rings bonded to an O-heterocycle.
A.
正确
B.
错误
【简答题】柱头虫属()门，其幼虫与()动物的()幼虫非常相似。
【简答题】Millie is a little fat. She wants to join a body club in the summer holiday. She has found some information about a body club. 小题1:What can Millie do in the club? A．Playing basketball. B．Swimming. C．P...
【简答题】哺乳类的肾脏从纵剖面上看，可区分为______、髓质和______三部分；肾脏的实质是由许多肾单位和排尿的集合小管构成的，肾单位由肾小体和______组成，而肾小体又是由______和肾小囊组成的。
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