皮皮学，免费搜题
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【单选题】
下列哪一个不是Southern印迹法的步骤?( )A.
用限制酶消化DNA
B.
用凝胶电泳分离DNA片段
C.
DNA与载体的连接
D.
DNA片段转移至硝酸纤维素膜上
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】在线索化二叉树中,t 所指结点没有左子树的充要条件是 ( )
A.
t -> lchild = NULL；
B.
t -> ltag = 1；
C.
t -> ltag = 1 且 t -> lchild = NULL ；
D.
以上都不对；
【单选题】在线索化二叉树中，t所指结点没有左子树的充要条件是( )
A.
t->ltag==1
B.
t->leftchild==NULL
C.
t->ltag==1且t->leftchild==NULL
D.
以上都不对
【简答题】A．He went on a trip. B．He went out shopping. C．He went to visit Tom and his wife. D．Both A and B
【单选题】在线索化二叉树中, t 所指结点没有左子树的充要条件是( )。
A.
t → lchild = =NIL
B.
t → ltag = =1
C.
t → ltag = =1 且 t → lchild = =NIL
D.
以上都不对
【单选题】He ______all his unfinished manuscripts to his colleagues in the laboratory before he went to France.
A.
transferred
B.
translated
C.
transmitted
D.
transacted
【单选题】He went away whistling, the dusty old book______beneath his arm.
A.
tucking
B.
to be tucked
C.
tucked
D.
having tucked
【判断题】His mind went back to that book—the book the lord Himself must have put into his hands out of the hundreds of Army library books sent to the Florida training camp. 他又回想起那本书—那必定是上帝亲自从佛罗里达训练营陆军图书馆的成百部书中...
A.
正确
B.
错误
【单选题】Last year his parents went to the west on business and he went to see his grandmother ______.
A.
for the time being
B.
over and over again
C.
once upon a time
D.
at regular intervals
【简答题】A．He went to the library twice to look for the book. B．He already returned the book to a library out of town. C．He called the library to say the book would be overdue. D．He couldn't return the library...
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