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【简答题】
电火花加工的基本原理及其必备的3个条件、以及电火花加工的本质机理（四个连续阶段）是什么？
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反馈参考答案：
举一反三
【简答题】The passage mentions ______ obstacles that stand in the way of energy conservation.
【简答题】Energy conservation and is the nature of the energy.
【单选题】Which of the following is an economical measure for energy conservation?
A.
Investing in new forms of facilities.
B.
Making more efficient refrigerators.
C.
Requiring white roofs for buildings.
D.
Toughening fuel economy standards.
【单选题】Discouraging the use of plastic belongs to the second type of energy conservation.
A.
Y
B.
N
C.
NG
【单选题】Why are subterranean buildings good for energy conservation?
A.
Because they use solar energy.
B.
Because they don't need central heating.
C.
Because the temperature there remains constant.
D.
Because they don't need air-conditioning.
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