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【多选题】
下列关于表面活性剂沉淀法说法正确的是？A.
十六烷基三甲基季胺溴化物 (CTAB) 属于 非离子型表面活性剂
B.
十六烷基氯化吡啶 (CPC) 是 用于分离粘多糖的有效沉淀剂
C.
十六烷基三甲基季胺溴化物 (CTAB) 是 用于分离粘多糖的有效沉淀剂
D.
CTAB 的沉淀效力极强 , 能从很稀的溶液中 ( 如万分之一浓度 ) 通过选择性沉淀回收黏多糖
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举一反三
【单选题】A.He frequently gets things mixed up.B.He is always finding fault with Marsha.#
A.
He frequently gets things mixed up.
B.
He is always finding fault with Marsha.
C.
He Ires been trying hard to cover for Marsha.
D.
He often fails to follow through on his projects.
【单选题】He ________ fault with me. How can we get on well with each other?
A.
always finds
B.
is always finding
C.
has always found
D.
will always find
【单选题】— The driver was not ____ for the traffic accident, was he'? — _____. It was the pedestrian's fault. [ ]
A.
blamed; Yes
B.
to blame; No
C.
blame; Yes
D.
blaming ;No
【单选题】A.He enjoys finding fault with exams. B.He is sure of his success in the exam. ##
A.
He enjoys finding fault with exams.
B.
He is sure of his success in the exam.
C.
He doesnt know if he can do well in the exam.
D.
He used to get straight As in the exams he took.
【简答题】A．He enjoys finding fault with exams. B．He is sure of his success in the exam. C．He doesn't know if he can do well in the exam. D．He used to get straight A's in the exams he took.
【单选题】The farmer told the picnickers to leave because he was unfriendly and fault-finding.
A.
Y
B.
N
C.
NG
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