【单选题】轮系末端是螺旋传动,如果已知末端转速nk=60r/min,双线螺杆的螺距为4mm,则螺母每分钟移动的距离为(0.8分)

【单选题】阿基米德蜗杆的轴向齿廓形状是(0.8分)

【单选题】如图 所示为某铣床 的主轴传动系统, V 轴的转速级数是 (3.0分)

【单选题】当两轴中 心距较大 时,通常设计成用如图( b )的结构来代替( a )的结构,说明了轮系能够 (a) (b) (0.8分)

【单选题】如图所示 的轮系中 ,齿条的移动方向是 (0.8分)

【单选题】当两轴相距较远,且要求传动准确,应采用(0.8分)

【单选题】有一 圆柱蜗杆传动 ,已知传动比 ,蜗轮齿数 , 其蜗杆头数 为 (0.8分)

【单选题】轮系的下列功用中,必须依靠周转轮系来实现(0.8分)

【单选题】已知单头圆柱蜗杆传动的蜗轮齿数为80,则其传动比为(0.8分)

【单选题】_____ in the queue for half an hour, Tom suddenly realized that he had left his wallet at home.

【单选题】已知双头圆柱蜗杆传动,蜗杆转速为720r/min,蜗轮齿数为40,则蜗轮转速为(0.8分)

【单选题】由运动结构简图可知,该传动系统是 (0.8分)

【单选题】火焰矫正时加热火焰一般采用( )。

【单选题】My advisor encouraged _____ a summer course to improve my writing skills.

【单选题】3. You can see a concert at the WOMAD festival.( )

【单选题】8. The Communicator translates words from English to other languages.( )

【单选题】渐开线蜗杆中具有渐开线齿廓的是(0.8分)

【单选题】如图所 示的轮 系中, Z1 、 Z3 、 Z4 、 Z6 同轴线, n1=900r/min 且 Z1=Z2=Z4=Z5=20 ,则 n6 的值为 (0.8分)

【单选题】The reporters hurried to the airport, only ____ that the film star had left.

【单选题】已知圆柱蜗 杆传动的蜗杆头数 ,转动速度 为 1440r/min ,蜗轮齿数 , 则蜗轮的转速 为 (0.8分)

【单选题】用箭头标注轮系旋转方向的不正确画法为(0.8分)

【填空题】1. Read the text again and then complete the missing parts of the text outline. I. An introduction to PC pollution (Paras 1-2) A. What is PC pollution (Para 1) B. The of PC pollution (Para 2) II. What to PC pollution (Para 3) III. to solve PC pollution (Paras 4-10) A. How people solved it in the past (Para 4) B. How solve it (Paras 5-6) C. Laws being passed to guarantee to solve the pollution problem (Paras 7-8) D. Actions being taken by some (Paras 9-10)

【单选题】在 图示的定轴轮 系中,齿轮 1 的转向如图中箭头所示,则齿轮 9 的转向为 (0.8分)

【单选题】I’d like to buy a house—modern, comfortable, and ____ in a quite neighborhood.

【单选题】4. There is something wrong with the printer.( )

【单选题】由运动 结构简图可 知,该轮系传动系统是 (0.8分)

【单选题】有一圆柱蜗杆传动,已知蜗杆头数 ,蜗轮齿数 , 其传动比为 (0.8分)

【单选题】7. The reason why the printer does not work is clear. ( )

【单选题】The government must take some measures _____ the city pollution.

【单选题】2. You cannot carry the Communicator in your purse.( )

【单选题】已知圆柱蜗杆传动的传动比为20, 蜗轮的转动速度是72r/min,则蜗杆转速为(0.8分)

【单选题】5. What is the author’s attitude towards PC pollution?( )

【单选题】蜗杆传动用于传递空间交错两轴间的运动和转矩,通常两轴间的交错角等于(0.8分)

【单选题】下列传动比中,加速传动的一项为(0.8分)

【单选题】可实现较大传动比的传动方案类型是(0.8分)

【单选题】6. The brand of the printer is Print-OK.( )

【单选题】轮系的末端是齿轮齿条传动,已知对应啮合的齿轮的模数m=2mm,齿数Z=30,末轴转速nk=60r/min,则齿条每分钟移动的距离为(0.8分)

【多选题】热处理法是利用材料在高温下( )来达到松弛焊接应力的目的。

【单选题】加工方法与车削梯形螺纹方法类似,工艺性能好、制造测量方便且应用广泛的是 (0.8分)

【单选题】已知单头圆柱蜗杆传动的蜗轮齿数为100,蜗杆的转动速度是360r/min,则蜗轮转速为(0.8分)

【单选题】关于 定轴轮系的传动比 ,以下各表达式中正确的是 (0.8分)

【单选题】The book is worthy of ______, I think.

【单选题】Having been ill in bed for nearly a month, he had a hard time____ the exam.

【填空题】3. Fill in the blanks with the information you hear. 1. Ms. Cline is . She is leaving for Brazil for a . 2. Frank is buying Ms. Cline’s . 3. Jim is making for the meeting and sending a fax. 4. Jeff and Aliza are cleaning the and making coffee.

【单选题】已知圆柱蜗杆传动的蜗杆头数为3,蜗轮齿数为30,则其传动比为(0.8分)

【单选题】已知双头圆柱蜗杆传动的传动比为30,则蜗轮的齿数为(0.8分)

【单选题】单头蜗杆的头数为(0.8分)

【单选题】下图中传动路线正确的是 (0.8分)

【单选题】蜗杆传动的传动比最大可为(0.8分)

【单选题】1. It is a newly bought printer.( )