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市场上品种最多、使用频率高的（）（）两种打印机。
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选填大写字母序号即可（A.B.C.D.）Choose the one which can fully express the meaning of the words given below:1. …heranged across the nation for more than a third of his life, digesting the new American experience before sharing it with the world as writer and lecturer.A. launch B. wander C. seek D. wonder2. In New York City the steamship “Quaker City” prepared to sail on a pleasurecruiseto Europe and the Holy Land.A. voyage B. crowd C. cloud D. boat3. I found another Twain as well — one who grew cynical, bitter, saddened by theprofound personal tragedies life dealt him…A. perfect B. deep C. proud D. desirable4. The geographiccore, in Twain’s early years, was the great valley of …A. centre B. thread C. edge D. front5. …a man who became obsessed with the frailties of the human race, who sawclearly ahead a black wall of night.A. processed B. observed C. occupied D. absorbed6. His popularity isattested by the fact that more than a score of his books remain inprint, and translations are still read around the world.A. prove B. arrest C. attend D. progress7. From them all Mark Twain gained a keen perceptionof the human race, of thedifference between what people claim to be and what they really are.A.understanding B. conceptionC. entrance D. percentage8. For eight months he flirted with the colossal wealth available to the lucky and thepersistent, and was rebuffed.A. puff B. oppose C. refuse D. reprove9. Casually hedebunked revered artists and art treasures, and took unholy verbalshots at the Holy Land.A. retell B. expose C. impress D. describe10. …Twain found the ultimate expression of escape from the pace he lived by andoften deplored, from life’s regularities and the energy-sapping clamor for success.A. look for B. ask for C. be in lack of D. disapprove of
主要通风机安设在回风井口，整个矿井通风系统处在低于大气压的负压状态，则该主要通风机工作方式为（ ）
在通风系统中既要隔断风流又要行人或通车的地方应设立（）
采区通风采用运输上山进风、轨道上山回风的缺点不包括（ ）
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