【判断题】粗加工时,产生的积屑瘤代替刀具切削,保护了刀具,减小了切削变形。
【单选题】What does the wagon represent for Elisa in the story?
【简答题】What kind of car does the woman plan to buy?A.A wagon. B.A sports car C.An estate car. D.An energy-saving jeep. Why did the man buy a jeep?A.He got a special price for it. B.He found its style attract...
【判断题】我们应该大方、礼貌地和陌生人交往,既不 回避畏缩, 也不 轻信草率 。
【简答题】成熟的啤酒花含有啤酒生产所需的酿造组份,其中苞叶、前叶含有 酿造组份;花粉颗粒(蛇麻腺)含有 酿造组份;
【单选题】(短语理解) For seven years I'd been a vegetarian. This past year I'd fallen off the wagon . What does the underlined phrase mean?
A.
throw oneself on the ground
B.
have a traffic accident
C.
back on an old habit after a period of abstinence.
D.
fall off the vehicle and hurt oneself
【单选题】What kind of car does the woman plan to buy?
D.
An energy-saving jeep.
【单选题】粗加工时希望产生积屑瘤,积屑瘤的硬度比工件材料的硬度高,能代替切削刃进行切削,起到保护切削刃的作用。同时积屑瘤的存在增大了刀具的 ( ),使切削轻快。