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【单选题】
光度法测乙醇中苯(波长=256nm)可用 作光源。A.
钨灯
B.
氢灯
C.
元素灯
D.
溴钨灯
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【单选题】Please sweep up all the glass______before anyone steps on them.
A.
chunks
B.
chips
C.
frames
D.
bulks
【单选题】听力原文： It seems so natural to put up an umbrella to keep the water off when it rains. But actually the umbrella was not invented as protection against rain, its first use was as a shade against the sun...
A.
In ancient China.
B.
In ancient Egypt.
C.
In ancient Greece.
D.
In ancient Rome.
【单选题】— Mary looks down today. What's up? — Well, __________ happened between May and It is none of your business. [ ]
A.
anything
B.
no matter what
C.
whatever
D.
everything
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