什么是耐旱树种？它具有哪些特点？
电钻用完后，（）将电钻放在安全、干燥、通风良好的地方，盘好电缆并悬挂起来。 ["必须卸下钎子杆","必须撤出木马","必须停止供水","必须切断电源"]
You share your computer with two users who belong to the Users group. You need to ensure that all users are informed of new updates. What should you do?（） ["A","B","C","D"]
液压操纵式离合器踏板自由行程调整的方法是拧动分离拉杆上的球形调整螺母，改变分离拉杆长度来实现。
“三座山试验”的设计者是（）. ["维果斯基","皮亚杰","蒙台梭利","福禄贝尔"]
叙述金属和合金在冷塑性变形过程中发生的组织性能的变化。
