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对砂岩酸化施工时使用的酸液为土酸,请说明: 1为什么不能单独使用HF? 2HCl的作用是什么? 3HF的浓度为什么用3%~5%?
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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
【单选题】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
【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。
【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
【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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