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下图中各箭头及其代表符号①②③④⑤表示太阳、地面、大气、宇宙空间之间的热力作用，其中包括太阳辐射、地面辐射、大气辐射、大气逆辐射、削弱作用（吸收、反射和散射），完成下列问题。 小题1:我国青藏高原的纬度比云贵高度高，但年太阳辐射总量比云贵，其原因主要与图中的哪个因素数值大小有关 A．② B．① C．③ D．④ 小题2:四川盆地的纬度与青藏高原的纬度相差不大，但年平均气温却比青藏得多，其原因主要与图中的哪个因素数值大有关 （ ） A．① B．② C．④ D．⑤
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【多选题】关于紫外线消毒,下列说法正确的是
A.
它可以是固定式的，也可以是活动式的，但距离被照射物不超过 1.2m为宜
B.
紫外线消毒方便实用，但不能彻底灭菌，特别是对细菌的芽孢杀灭效果较差
C.
紫外线对人体有伤害作用，不可直视，更不能在开着的紫外灯光下工作
D.
紫外线可用于所有病原微生物的消毒
【简答题】如图所示,黑客入侵到R4路由器,并设置好LoopBack地址,这样的作用是什么?
【简答题】河流袭夺的原因有哪两种?
【简答题】如上图。已知 U AB =2V U BC =3V ,求各点电位。 1 A 为参考点 2以 B 为参考点 3以 C 为参考点
【单选题】选出与题干意思相近的选项 Many people may not want to retire early because it would do harm to their mental and emotional well-being.
A.
But even if people are able to economically support a retirement at 65, over thirty years of potential inactivity is harmful to cognitive and emotional vitality. Many people may simply not want to do it.
B.
A multi-stage life will have profound changes not just in how you manage your career, but also in your approach to life. An increasingly important skill will be your ability to deal with change and even welcome it.
C.
In a three-stage life, people leave university at the same time, they tend to start their careers and family at the same age, they proceed through middle management all roughly the same time, and then move into retirement within a few years of each other. In a multi-stage life, you could be an undergraduate at 20, 40, or 60; a manager at 30, 50 or 70; and become an independent producer at any age.
D.
A three-stage life has few transitions, while a multi-stage life has many. That is why being self-aware, investing in broader networks of friends, and being open to new ideas will become even more crucial skills.
【简答题】两段导线AB=BC=0．1 m，在B处连接成60°角．使导线ABC在匀强磁场中匀速运动．已知导线运动的速度v=1．5 m／s，运动方向垂直于AB，如图8-8所示，磁感应强度B=2．5×10-2T．导线上的电势差U=____V，____点的电势高．
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