【单选题】The earth around the sun.
【单选题】The earth around the sun.
【单选题】The earth around the sun.
【简答题】现要加工四个渐开线标准直齿圆柱齿轮,其中齿轮1:m1=2mm、z1=50;齿轮2:m2=5mm、z2=20,齿轮3:m3=2mm、z3=25,齿轮4:m4=2mm、z4=48;下列叙述正确的是___________。
【单选题】The earth around the sun.
【单选题】______with so much trouble, we failed to complete the task on time.
【多选题】一对渐开线直齿圆柱齿轮标准安装有如下特点,正确的是 。
【简答题】Faced with so much trouble, we failed (complete) the task on time.