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柴油机排气管冒黑烟的主要原因是哪些？

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(Science Has Spoiled My Supper) The author hates frozen foods in spite of their seeming advantages. ()

(The Tragedy of Old Age in America) Old people who are poor have been poor all their lives. ()

发放火工品时应注意什么问题？

进入井下炸药库的火工品，必须使用()或()，必须()，运输队及时将火工品运到炸药库。