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【简答题】
people today prefer online entertainment such as listening to music, watching movies or playing computer _________.
手机使用
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新浪微博
分享QQ
微信扫一扫
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举一反三
【简答题】某收音机输入回路的等效电路如题图E3—24所示，其中R=8．5Ω，L=350uH。 (1)欲使电路对550kHz，1mV的信号产生谐振，C应为多大?此时电容两端的电压为多少? (2)若信号源变为600 kHz，1mV时，电容两端的电压又为多少?
【单选题】— Space travel must be very very expensive. — . The cost of a seat on the Virgin craft is $ 250,000.
A.
That’s not true.
B.
Of course.
C.
Why do you think so?
【简答题】The bread must be very old, It's very dry and ______. A) stale B) shabby C) barren D) fresh
【单选题】You must be very careful when handling these acids______they are very concentrated.
A.
as
B.
when
C.
if
D.
while
【单选题】我国证券市场的自律性管理机构主要包括()。I、证券业协会。II、证券交易所。III、基金管理公司。IV、证券公司。
A.
I、II
B.
I、IV
C.
II、IV
D.
III、IV
【简答题】由CMOS门电路组成的施密特触发器如图7．1．3(a)所示，已知R1=5 kΩ，R2=10 kΩ，VDD=5 V，VOH≈5 V，VOL1≈0 V，VTH1=2．5 V。 (1)计算正向、负向阈值电压及回差电压。 (2)当阈值电压变为 时，若使回差电压不变，对电阻有何要求?此时正向、负向阈值电压为何值?
【单选题】Some people who are very intelligent and successful in their fields find _______ difficult to succeed in language learning.
A.
which
B.
how
C.
that
D.
it
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