【单选题】It is essential to follow a firm and______political line.
【判断题】在大学生成才目标中,德是人才素质的条件。()
【判断题】圆柱销不宜多次装拆,否则会降低定位精度和连接的紧固。
【单选题】圆柱销不宜多次装拆,否则会降低定位精度和连接的().
【单选题】To produce artificial noses for practical use, it is essential to invent chips sensitive to various chemicals.
【单选题】It is essential to follow these steps to write a good thesis.