直流电动机有哪几种调速方法？各有哪些特点？
下列关于脑卒中患者上下楼梯训练的说法中错误的是（） ["上楼时健足先上，患足后上","下楼时健足先下，患足后下","治疗师站在患者的健侧为宜","循序渐进原则","心理支持，消除恐惧感"]
简述游戏不同风格在游戏中的应用。
在电脑设计中，塑造色彩的基本手段是（） ["色相变化","阶调调节","明度变化","纯度调节"]
Which two statements are true about the protocols that are used for transmitting voice traffic？（） ["RTP multiplexing is used to keep multiple phone conversations separate","RTP provides end-to-end delivery services for voice traffic","UDP is used to ensure a reliable transmission from sender to receiver","RTP is used to provide resource reservation for the voice stream","UDP provides multiplexing"]
价值属性。
