Cast iron pistons used in large propulsion diesel engines are constructed with （） not taper what so ever。 the skirt being tapered and smaller than the crown。 the skirt being tapered and larger than the crown。 the crown being tapered and smaller than the skirt。
舷侧纵桁与强肋骨、主肋骨及横舱壁的连接形式是什么？
丙纶丝滤机反洗时要保证压缩空气间断连续运行，避免发生压缩空气管路进酸性水而（）管路。 冲坏。 拆卸。 切断。 腐蚀。
主肋骨及其安装有何规定？
为什么企业可以建立、实施一体化管理体系？
The daily predictions of the times and heights of high and low water for a selection of Standard Ports are given in（）.
