Which statements are true concerning the effect of the >> and >>> operators?（） ["For non-negative values of the left operand， the >> and >>> operators will have the same effect.","The result of （-1 >> 1） is 0.","The result of （-1 >>> 1） is -1.","The value returned by >>> will never be negative as long as the value of the right operand is equal to or greater than 1.","When using the >> operator， the leftmost bit of the bit representation of the resulting value will always be the same bit value as the leftmost bit of the bit representation of the left operand."]
如果温度变送器出现温度示值偏低或不稳故障现象时可能的原因是什么？处理方法？
员工福利计划具有以下功能（） ["保护和配置劳动力功能","激励员工积极性","补偿功能","吸引人才、留住人才的有效措施","劳资关系协调功能"]
唐代诗人杜甫是（）。 ["现实主义诗人","浪漫主义诗人","豪放派词人","婉约派词人"]
腰麻
学前儿童科学教育应引导儿童获取广泛的科学技术经验，并在经验的基础上， 建立（）水平的初级科学概念。
