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【单选题】
为了提高555定时器组成的多谐振荡器的频率，外接R、C值应（）。A.
同时增大RC值
B.
同时减小RC值
C.
同比增大R值减小C值
D.
同比增大C值减小R值
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【单选题】Mrs. Jackson has received ______ that she finds it difficult to obtain a desirable job.
A.
so little education
B.
such little education
C.
a so small education
D.
a such little education
【单选题】With everything needed_____, Mrs. Jackson went to the supermarket after work in a hurry.
A.
buying
B.
to buy
C.
bought
D.
Buy
【简答题】阅读理解。 Since her husband died, Mrs. Jackson has lived alone in their big old sub (郊区的) house. The house was bought by her husband almost fifty years ago. For the sake of safety (为安全起见), her son ha...
【单选题】— Have you known Mrs. Jackson for a long time? — Yes, since she _____ the music club. [ ]
A.
has joined
B.
joins
C.
had joined
D.
joined
【简答题】自动驾驶中所提及的V2N技术是指
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