how to operate incinerator ？ what kind of garbage can not be thrown into incinerator ？
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Which system should be supplied to obtain the best efficiency and lowest emissions？
A. Lean combustion principle
B. Fuel oil system
C. Electrical control system
D. Electronic control system
For _______the power is supplied by main switchboard directly not through sub-board
A. saving network cost
B. improving the reliability of supplying power to important load
C. preventing sequence reversing
D. increasing the power Factor of important load
are you experienced with following machines or operation ？
如果一国政府有1 000亿美元的预算赤字，那么国债会发生什么变化？
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