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【简答题】
RLC串联电路中,已知: R=30 欧, XL=80 欧, XC=40 欧,电源电压u=220 √2sin(314t+30°)V ,求电路中的总阻抗;电路中电流的有效值;各元件上的电压有效值;电路中的有功功率、无功功率、视在功率。
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【简答题】完形填空。 Some years ago, Chinese high school students would show their school-bags, new clothes or new pens to their classmates when the new term started, Today, however, all have 1 . If you still come b...
【单选题】Although some students graduate from high school, they are virtually illiterate ______ writing a business letter.
A.
in the event of
B.
in the light of
C.
in case of
D.
in terms of
【单选题】---- Is it high time that we _____ on the school building? ---- Yes, it _____.
A.
do some repairs; is
B.
do some repair; is
C.
did some repairs; is
D.
did some repair; was
【简答题】Mobile phone has become a problem for high schools. Some high-school students in Australia are not allowed to carry mobile phones during school hours. Mobile phone used among children has become a pro...
【单选题】Although some students graduate from junior high school, they are ______ illiterate, never having learned to read or write well.
A.
gradually
B.
virtually
C.
continually
D.
internally
【简答题】阅读理解。 Mobile phone has become a problem for high schools. Some high-school students in Australia are not allowed to carry mobile phones during school hours. Mobile phone used among children has become...
【单选题】— I have some exciting news to tell you. Our school has been named a model high school. — _____. That's really great! [ ]
A.
Pardon?
B.
Has it?
C.
Good idea
D.
Congratulations!
【单选题】Not __________, with youth unemployment so high, some school – leavers with qualifications fail to find jobs
A.
obviously
B.
surprisingly
C.
particularly
D.
normally
【简答题】The mobile phone has become a problem for high schools. Some high-school students in Australia are not allowed to carry mobile phones during school hours. The mobile phone used among children has beco...
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