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【单选题】
生产上采用循环反应的目的是( )。(如尿素生产,氨的合成)A.
提高原料利用率
B.
减少惰性气体排放
C.
提高设备生产强度
D.
提高空速
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【简答题】已知电路如图所示，Z 1 =(5+j5)Ω，Z 2 =(6-j8)Ω， ，试求Z、 。
【简答题】When Mark Twain became a miner in the frontier region, he started to write.
【简答题】电路如题图所示，R 1 =6Ω，电路原已处于稳态，t=0时S闭合，并已知t＞0时： 。试求I S 、R 2 、L、C、u C (t＞0时)。
【单选题】The new law has come into effect, and ________ number of wild animals here is on ________increase now. [ ]
A.
the; the
B.
a; the
C.
the; /
D.
a; /
【多选题】入所教育的主要学习内容包括 等 。
A.
《禁毒法》
B.
《戒毒条例》
C.
《司法行政强制隔离戒毒所强制隔离戒毒人员行为规范》
D.
《司法行政强制隔离戒毒所戒毒人员守则（试行）》
【单选题】A production possibilities frontier is a straight line when
A.
the more resources the economy uses to produce one good, the fewer resources it has available to produce the other good.
B.
an economy is interdependent and engaged in trade instead of self-sufficient.
C.
the rate of tradeoff between the two goods being produced is constant.
D.
the rate of tradeoff between the two goods being produced depends on how much of each good is being produced.
【简答题】Peter’s job was to examine cars when they crossed the frontier to make sure that they were not smuggling(走私) anything into the country. Every evening he would see a factory worker coming up the hill t...
【简答题】Peter’s job was to examine cars when they crossed the frontier(边界) to make sure that they were not smuggling(走私) anything into the country. Every evening he would see a factory worker coming the hill ...
【简答题】Peter's job was to examine cars when they crossed the frontier (边界) to make sure that they were not smuggling (走私) anything into the country. Every evening he would see a factory worker coming __36__ ...
【单选题】When a production possibilities frontier is linear it shows
A.
a truer picture of real life than a bowed out production possibilities frontier.
B.
that resources are perfectly shiftable from the production of one good to another.
C.
an example of increasing opportunity cost.
D.
All of the above are correct.
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