液压控制阀，除按用途和工作特点不同分类，还可按压力高低、控制方式、结构形式和连接方式等不同来分类。
参考答案：对
Had she __________ her promise, she would have made it at Beijing University.
A．looked up to
B．lived up to
C．kept pace with
D．come up with
正确测量婴幼儿身长的方法是()
A．将清洁布平铺在测量床上
B．婴儿脱去帽子和鞋袜
C．小儿头顶轻贴量板的顶端
D．推板与小儿身体长轴呈90°角
E．测量者左手固定小儿双踝关节，右手推滑板至足尖部
