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【单选题】
在 RC 文氏桥正弦波振荡电路中,为了满足振荡的相位平衡条件,放大电路的输出信号与输入信号的相位差的适合值为 。A.
90 °
B.
180 °
C.
270 °
D.
360 °
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反馈参考答案：
举一反三
【单选题】. With their son ______ a foreign college now, the parents have some financial problems now and then.
A.
to attend
B.
attending
C.
attended
D.
having attended
【单选题】College loans are now much harder to obtain. _________, most college students must work at least part time.
A.
Furthermore
B.
Similarly
C.
Consequently
D.
However
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