【单选题】“VIN车辆识别代号编码”由一组字母和阿拉伯数字组成,共( )位,又称( )位识别代号编码。
【单选题】It is important that the committee_________ about the project at once. A) will be informed B) be informed C) is informed D) being informed
【简答题】it is important that the police ______ about the case. A) are informed B) informed C) be informed D) will be informed
【单选题】关于圆柱齿轮的画法,下面叙述中正确的是 _______ 。
A.
.在齿轮投影为圆的视图中,啮合区域内两齿轮的齿顶圆用细实线绘制
D.
.在垂直齿轮轴线方向投影为非圆的视图中,两齿轮啮合区域的节线应画成虚线