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当前学科：电网调度自动化运行值班员技师
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当电力系统受到较大干扰而发生非同步振荡时，为防止整个系统的稳定被破坏，经过一段时间或超过规定的振荡周期数后，在预定地点将系统进行解列，该执行振荡解列的自动装置称为（）.
A . A、低频、或低压解列装置
B . B、联切负荷装置
C . C、稳定切机装置
D . D、振荡解列装置
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Dear Sirs, RE: COUNTER-OFFER FOR MOUNTAIN BICYCLES Thank you for your letter about the offer for the captioned mountain bicycles．Although we appreciate the quality of your bicycles, their price is too high to be acceptable．Refering to the sales contract No．8998, you will find that we ordered 1000 bicycles with the same brand as per the terms and conditions stipulated in that sales contract, but the price was 15% lower than your present price．Since we placed the last order, price for raw materials has been decreased considerably．Retailing price for your bicycles here has also been reduced by 5%．Accepting your present price will mean great loss to us, let alone profit．We would like to place repeat orders with you if you could reduce your price at least by 15%．Otherwise, we have to shift to the other suppliers for our similar request. We hope you take our suggestion into serious consideration and give us your reply as soon as possible. Yours truly,
油品液面稳定时间，轻油约需15～30min，原油或重油需30min，铁路罐车或汽车罐车约需（）min。