【判断题】加工时,要尽量使影响加工精度的原始误差出现在误差非敏感方向。
【判断题】加工时,要尽量使影响加工精度的原始误差出现在误差非敏感方向。
【单选题】下列特点,哪一项属于特异性免疫反应?()
【单选题】In September 1944 he was able to return to his academic duties, but soon after the war ended he _____ a serious illness and did relatively little research thereafter.
【单选题】distinct [dis5tiNkt]
A.
adj. 清楚的, 明显的, 截然不同的, 独特的
B.
n. 区别, 差别, 级别, 特性, 声望, 显赫
【简答题】v. 区分 , 辨别 , 分清 d_______
【简答题】In September 1944 he was able to return to his academic duties, but soon after the war ended he _____ a serious illness and did relatively little research thereafter.
【简答题】图示钢杆承受P= 120 kN的轴向拉力,若用于制造钢杆的板材厚度为20mm,许用拉应力[σ]= 175 MPa,许用切应力[τ]= 100 MPa,许用挤压应力[σb]= 350 MPa,若螺钉材料与钢杆材料相同;试求钢杆端部的尺寸b。 【图片】【图片】