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【单选题】
频率稳定性能最好，频率范围最宽的正弦波振荡器为（）A.
DDS振荡器
B.
石英晶体振荡器
C.
RC振荡器
D.
LC振荡器
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举一反三
【单选题】I've seen Donna in lots of movies, but I've never seen her _____.
A.
in person
B.
in reality
C.
in practice
D.
in theory
【单选题】I don't know why she is looking at me she knew me. I've never seen her.
A.
as
B.
although
C.
even if
D.
as if
【单选题】I don't know why she's looking at me _____ she knew me. I've never seen her before in my life. [ ]
A.
as
B.
although
C.
as if
D.
even if
【单选题】I've seen Donna in lots of movies , but I've never seen her-
A.
A in person
B.
in reality
C.
in practice
D.
in theory
【单选题】急性胰腺炎的典型症状是
A.
上腹部烧灼样疼痛，进食后可缓解
B.
上腹部持续性剧烈疼痛，向腰背部放射
C.
阵发上腹部钻顶样疼痛，辗转体位
D.
脐周阵发性疼痛，停止排便和排气
E.
上腹部剧烈疼痛，左上臂内侧放射
【单选题】I don't know why she's looking at me ______ she knew me. I've never seen her before in my life. [ ]
A.
as
B.
although
C.
even if
D.
as if
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