皮皮学，免费搜题
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搜题
【单选题】
食管癌的早期表现是A.
吞咽哽噎感
B.
吞咽困难
C.
声音嘶哑
D.
持续性胸背痛
E.
呕吐泡沫样黏液
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皮皮学刷刷变学霸
举一反三
【单选题】()you wish to know why we have placed no further orders with you recently, we are willing to raise a matter that caused us some trouble .
A.
since
B.
though
C.
as
D.
although
【单选题】We note that you wish us to insure shipment to you ()10% invoice value.
A.
within
B.
on
C.
with
D.
by
【单选题】《时速200公里铁路道岔技术条件》（暂行）规定，60-12号提速道岔尖轨非工作边与基本轨工作边的最小间距不小于（）。
A.
46ｍｍ
B.
50ｍｍ
C.
63ｍｍ
D.
70ｍｍ
【单选题】水在 100°C,标准压力下沸腾时,体系的吉布斯自由能变化为()
A.
Δ G <0< /div>
B.
Δ G >0
C.
Δ G = 0
【单选题】We are pleased to know that you have planned to come to the Autumn Guangzhou Fair. We wish to discuss with you some other important things if you could come ______ your earliest convenience.
A.
by
B.
on
C.
in
D.
at
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