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【多选题】
病毒分离的培养方法主要有A.
培养基分离法
B.
组织细胞培养法
C.
动物接种法
D.
鸡胚培养法
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举一反三
【简答题】In this article the author relies chiefly on ______to support his main arguments.
【单选题】The author begins his article with ______.
A.
an anecdote about his grandparents
B.
a quotation from his grandparents
C.
a description of, and a comment on, his grandparents' principle of life
D.
his admiration at his grandparents' way of life
【简答题】《机械制图习题集》第二版 田凌 许纪旻 清华大学出版社 p29:3-3-2-10,P32:学号为单号的做1.3.5,学号为双号的做2.4.6 P29:第10题 P32:第1题 P32:第2题 P32:第3题 P32:第4题 P32:第5题 P32:第6题
【单选题】The author mentioned 'Yankee' in his article was to ______.
A.
show his hatred towards westerners
B.
give a vivid image of tall tales to us
C.
laugh at American
D.
illustrate the characteristic of tall tales
【简答题】In this article the author uses ______ to support many of his important points in the news story.
【单选题】The author begins his article with ______________________.
A.
an anecdote about his grandparents
B.
a quotation from his grandparents
C.
a description of, and a comment on, his grandparents' principle of life
D.
his admiration of his grandparents' way of life.
【简答题】在下图 所示桥式整流电路中,已知变压器二次绕组电压 U 2 =100V , R L =3k Ω,交流电源频率为 50Hz ,若忽略二极管的正向电压和反向电流。试求: ( 1 ) R L 两端电压的平均值 U O ; ( 2 )流过 R L 电流的平均值 I O ; ( 3 )流过二极管的电流 I D 及二极管承受的最高反向电压 U RM 。
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