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【多选题】
下列关于细胞mRNA转录的表述正确的是（ ）A.
其中可以含有多个蛋白质的编码框
B.
其 3 ’末端的产生依赖于多聚腺苷酸化信号序列
C.
在其被转录完成后会进行 5 ’端的加帽修饰
D.
mRNA 被合成释放之后， RNA 聚合酶 II 仍可以在 DNA 模板上继续前进，合成另一段 RNA分子
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【单选题】电路如图所示,已知 R 1 = 5k Ω , R 2 = 15k Ω , R 3 = 10k Ω , R C = 2k Ω , R E = 2k Ω , 当电阻 R 2 不慎被短路后 ,( 如图 ), 该电路中的晶体管处于〔〕。
A.
截止状态
B.
放大状态
C.
饱和状态
【简答题】已知电路如图所示，R 1 =10kΩ，X L1 =X L2 =10kΩ，X M =2kΩ，试求负载Z L 获得最大功率条件。
【单选题】电路如图所示,已知 R 1 = 5k Ω , R 2 = 15k Ω , R 3 = 10k Ω , R C = 2k Ω , R E = 2k Ω , 当电阻 R 2 不慎被短路后 ( 如图 ) , 该电路中的晶体管处于( ) 。
A.
截止状态
B.
放大状态
C.
饱和状态
D.
开关状态
【简答题】f(n)为n 的各位数字之和，如14 +1=197，1+9+7=17，则f(14)='17.' 记f (n)=f(n),f 则f _________
【单选题】Newcomers When a country is under-populated, newcomers are not competitors, hut assistants. If more come they may produce not only new quotas, but a surplus as well. In such a state of things land is ...
A.
scarce
B.
sacred
C.
abundant
D.
extractive
【简答题】The newcomers found it impossible to ______ themselves to the climate sufficiently to make permanent homes in the new country. A) suit B) adapt C) regulate D) coordinate
【单选题】What is the attitude of the newcomers from different cultures towards finishing the work fast?
A.
Unimportant.
B.
Respectful.
C.
Successful.
D.
Serious.
【简答题】已知f（x）是指数函数，且f（1+ 3 ）?f（1- 3 ）=9，则f（2+ 17 ）?f（2- 17 ）的值为______．
【单选题】In the sentence 'these newcomers will be at their own expense' (Line 2, Paragraph 3), 'their' probably refers to ______.
A.
these newcomers
B.
rich countries in 'first-world'
C.
many bosses, workers and politicians
D.
bosses, workers and politicians in the rich world
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