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欲设计一标准斜齿圆柱齿轮传动,已知传动比 i=4.808 ,法向模数 m n =2mm ,中心距 a=155mm , 初选螺旋角 β 为 1 3 ° , (cos13 ° =0.9743; cos9.933° = 0.9848; cos13.051 ° = 0.97419; cos17.133 ° =0.9556, 试确定这对齿轮的以下参数 (结果保留小数点后3位,齿数圆整为整数): 小齿轮齿数 z1= ___ __ ___ ; 大齿轮齿数 z 2 =________ ; 实际螺旋角 β = ________° ; 分度圆直径 d1= ________ mm ; d 2 =________mm ; 齿顶圆直径 d a1 =________mm ; d a2 =________mm ; 齿根圆直径 d f 1=________mm ; d f 2=________mm ;
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【简答题】用自己写的演讲稿进行演讲练习,并录制自己演讲的视频(有困难可录制音频)。 视频上传附件。
【简答题】A．It means that the name Pearl Buck was used only at home. B．It means a word concerning house work. C．It means that Pearl Buck was well known. D．It means that Pearl Buck used to be a housewife.
【简答题】A．From the name of the horse first used to carry mails. B．From the name of the city where this service first started. C．From the name of the office along the road. D．From the name of the stopping plac...
【单选题】Arthur Momand used the name 'Jones' in his series of short stories because 'Jones' is ______.
A.
an important name
B.
a popular name in the United States
C.
his neighbor's name
D.
not a good name
【简答题】请你以《我的大学生活》为题,撰写演讲稿,并在课余时间进行演练,同时制作成 3-5分钟的演讲录音 ——在作业页面上传你的这份演讲稿文字稿和录音。
【简答题】If rhyme is used in the tagline and the brand name is mentioned, make sure that the name is ______.
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