皮皮学，免费搜题
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搜题
【单选题】
实现音频信号数字化最核心的硬件电路是()。A.
A/D转换器
B.
D/A转换器
C.
数字编码器
D.
数字解码器
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】I had a little trouble _____ English grammar. [ ]
A.
learn
B.
learned
C.
learning
D.
to learn
【单选题】It is important for us ______ English well. [ ]
A.
learn
B.
learned
C.
to learn
D.
to learning
【简答题】Only years later _____ the truth about the matter. A) I learned B) did l learn C) I did learn D) had I learned
【单选题】Do you have any trouble _______ English grammar? [ ]
A.
learn
B.
learned
C.
learning
D.
to learn
【简答题】learn--learned--
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