【判断题】离心式水泵的叶片与叶轮旋转平面之间应有一偏扭角。
【简答题】The company has successfully expanded its market.(英译汉)
【简答题】幂函数在第一象限的图像都经过一个定点坐标是
【简答题】The report shows that the market is on a ______ trend.
【单选题】The development trend of the market is
B.
going to be horizontal.
C.
strictly vertical or horizontal.
【单选题】人用肉眼能分辨的最小距离一般为( ) mm 。