皮皮学，免费搜题
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【多选题】
下列描述中哪些是 PCR 扩增条带出现模糊拖尾现象的原因A.
反复冻融或放置时间太长导致模板降解。
B.
退火温度太低。
C.
抽提模板核酸时污染了基因组 DNA 和蛋白质等。
D.
缓冲液配置时间太长电压太量过大等电泳问题
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】在PS中,制作无缝贴图时,经常左右或上下移动图像,使用的工具是( )
A.
滤镜/其它/位移
B.
滤镜/其它/最大值
C.
滤镜/其它/最小值
D.
滤镜/其它/自定义
【简答题】请简述我国药事组织的类型。
【单选题】What ________ if there ______ no water or air on the earth?
A.
happen, is
B.
will happen, is
C.
will happen, will be
D.
happen ,are
【单选题】I didn't know what to do but then an idea suddenly ______ to me.
A.
occurred
B.
entered
C.
happened
D.
rushed
【单选题】—What _____ to your village in recent years? —Lots of roads, buildings, parks and so on.
A.
have happened
B.
happened
C.
has happened
【简答题】简述药事组织的类型及功能
【单选题】The police said they would not give up looking into other possibilities ____they find out what happened.
A.
as
B.
while
C.
until
D.
although
【简答题】简述药事组织的主要类型
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