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【单选题】
An increase in expected future output while holding today's output constant wouldA.
increase today's desired consumption and increase desired national saving.
B.
increase today's desired consumption and decrease desired national saving.
C.
decrease today's desired consumption and increase desired national saving.
D.
decrease today's desired consumption and decrease desired national saving.
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【多选题】What is the waste mean?
A.
waste gas
B.
waste water
C.
waste residue
D.
waste medical
【简答题】阅读理解。 Waste to Energy-JUST BURN IT! WHY BURN WASTE? Waste-to-energy plants generate (产生) enough electricity to supply 2.4 million households in the US. But, provrding electricity is not the major adva...
【单选题】这类树种对烟尘及有害气体有较强抗性,还能吸收部分有害气体,起到净化空气的作用,特别适于厂矿和特殊地区绿化要求:
A.
孤植树
B.
抗污染植物
C.
行道树
D.
绿篱树
【单选题】Waste paper, waste glass, and waste iron can all be _____.
A.
made
B.
taken
C.
recorded
D.
recycled
【多选题】What kind of waste does Shanghai's waste sorting system have?
A.
Household food waste
B.
Recyclable waste
C.
Hazardous waste
D.
Residual waste
【简答题】晶闸管的导通条件是什么 ? 导通后流过晶闸管的电流和负载上的电压由什么决定 ? 2.晶闸管的关断条件是什么 ? 如何实现 ? 晶闸管处于阻断状态时其两端的电压大小由什么决定 ? 3. 试说明晶闸管有哪些派生器件?
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