-
题目： 问答题
用-10mm钻头钻孔,选择进给量为0.2mm,当钻进40毫米深时,用了0.5分钟,求钻孔时的切削速度是多少?
答案不对？请尝试站内搜索
推荐知识点:
- 阳和汤适于治疗阴疮的哪一证型（）
- 医疗机构发现甲类传染病患者、病原携带者应当予以隔离治疗。拒绝隔离治疗或者隔离期未满擅自脱离隔离治疗的，可以由以下哪个部分协助医疗机构采取强制隔离治疗措施（）。
- 在识读悬臂拼装预应力箱梁施工图时，应着重注意（）及各块件之间接缝处预留管道对正情况。
- 热电阻进行数字温度处理的主要内容有（）
- （）构成了我国银行业实际监管工作中的依据和准绳。
- 试述急性白血病的临床表现及护理。
- 可以使肠内酸化，减少氨吸收的药物是（）。
- A Bridge for Squirrels San Francisco has its cable cars. Seattle has its Space Needle. And， Longview has its squirrel bridge. The bridge， which has attracted international attention， is now a local landmark. The Nutty Narrows Bridge was built in 1963 by a local builder， Amos Peters， to give squirrels a way to cross the busy road without getting flattened by passing cars. The original bridge was built over Olympia Way on the west edge of the library grounds. Before the bridge was built， squirrels had to avoid traffic to and from the Park Plaza office building where office staff put out a nutty feast for the squirrels. Many times， Peters and others who worked in and near Park Plaza witnessed squirrels being run over. One day Peters found a dead squirrel with a nut still in its mouth， and that day's coffee break discussion turned into squirrel safety. The group of businessmen cooked up the squirrel bridge idea and formed a committee to ask the blessing of the City Council （市政会）.The Council approved， and Councilwoman Bess LaRiviere jokingly named the bridge "Nutty Narrows". After architects designed the bridge， Amos Peters and Bill Hutch started construction. They built the 60-foot bridge from aluminum and lengths of fire hose （消防水带）. It cost 1000. It didn't take long before reports of squirrels using the bridge started. Squirrels were even seen guiding their young and teaching them the ropes. The story was picked up by the media， and Nutty Narrows became known in newspapers all over the world. In 1983， after 20 years of use， Peters took down the worn-out bridge. Repairs were made and crosspieces were replaced. The faded sign was repainted and in July 1983， hundreds of animal lovers attended the completion ceremony of the new bridge. Peters died in 1984 ，and a ten-foot wooden squirrel sculpture was placed near the bridge in memory of its builder and his devotion to the project. What does the underlined phrase "teaching them the ropes" probably mean in the text？（）
- 下面描述是MCS-51系列单片机特点的是（）。