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【多选题】
下列方法适于对分析碱性化合物和醇类气相色谱填充柱载体进行预处理的是( )。A.
硅烷化
B.
酸洗
C.
碱洗
D.
釉化
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皮皮学刷刷变学霸
举一反三
【单选题】Many years had ________ before they returned to their original urban areas.
A.
floated
B.
elapsed
C.
skipped
D.
proceeded
【简答题】为了防止二恶英生成,焚烧炉燃烧室要保持足够的温度(一般 °C以上 ),气体停留时间(不少于 s ),应确保废气中的氧含量在 - 之间。
【单选题】In the Announcement to K'ang, it is said, "He was able to make his virtue _____."
A.
illustrious
B.
illusion
C.
illustration
D.
illustrated
【简答题】In the Announcement to K'ang, it is said, "The ___ indeed may not always rest on us"
【单选题】Only after many years of hard work ____ that money alone does not lead to happiness and success.
A.
I did realize
B.
had I realized
C.
did I realize
D.
I had realized
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