【判断题】从调节的角度来看, SPWM 逆变器非常适用于交流变频调速系统。
【单选题】In September1944 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(从那以后).
【多选题】《药品目录》中,“备注”栏标有“◇”的药品,因其组成和适应症类似而进行了归类,所标注的名称为一类药品的统称。以下属于凡例中归类的有()
【简答题】In September 1944 he was able to return to his academic duties, but soon after the war ended he ____(患上了)a serious illness and did relatively little research thereafter .
【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.
【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 ( 从那以后 ).
【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】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】