几道题·······················1.白炽灯的灯丝,工作时的温度通常在2000℃以上.是根据熔点表分析,应该选什么材料制作灯丝?为什么?2.你认为影响蒸发快慢的因素有哪些?请设计一个

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几道题·······················1.白炽灯的灯丝,工作时的温度通常在2000℃以上.是根据熔点表分析,应该选什么材料制作灯丝?为什么?2.你认为影响蒸发快慢的因素有哪些?请设计一个
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几道题·······················1.白炽灯的灯丝,工作时的温度通常在2000℃以上.是根据熔点表分析,应该选什么材料制作灯丝?为什么?2.你认为影响蒸发快慢的因素有哪些?请设计一个
几道题·······················
1.白炽灯的灯丝,工作时的温度通常在2000℃以上.是根据熔点表分析,应该选什么材料制作灯丝?为什么?
2.你认为影响蒸发快慢的因素有哪些?请设计一个实验,探究其中的一个因素.
要求：写明选用器材、主要步骤及现象和结论.
3.怎么使潮湿的衣服尽快变干,写下你采取的三个措施.
4.据《北京晚报》报道,2001年5月20日,新疆罗布泊地区阴天,气温约为-15℃,在沙漠的沙丘上覆盖着约5cm~10cm后厚的积雪,然而过了约20min看不见了,而脚下却是干爽的沙地,这一现象令在场的科学考察队的队长膛目结舌,请你用所学的知识回答这雪为什么不见?

几道题·······················1.白炽灯的灯丝,工作时的温度通常在2000℃以上.是根据熔点表分析,应该选什么材料制作灯丝?为什么?2.你认为影响蒸发快慢的因素有哪些?请设计一个
1.钨丝熔点高于3000
2.有温度,物体面积,和物体周围流速,同样湿的一件衣服放在20度和60度下实验看哪个快
3.升高温度,将衣物铺平,放在通风处
4.雪瞬间蒸发因为只有蒸发能在任何温度进行

···· · · · ···· ·········· ·········· 求··············· 什么植物有应激性只要植物名 ········································································································· 急·························· 急 ··············急············ 这是什么蛾类昆虫?如题请给予回答··········································································· 写一个关于动物的拟人句急急急呀······································································································ 怎样计算摩尔质量?要详细啊························································· 是正确答案,希望!急需·······································································我涨加了，快······························ 寒冬腊月的意思急啊····································································································· 帮忙········· 江南春中的绿映红的意思谁能告我,求····································································································