半导体电阻的大小随温度的变化会发生明显的改变,用半导体材料制成的电阻叫热敏电阻.热敏电阻可以用来监控汽车元件温度的变化,如图(a)所示是热敏电阻的阻值随温度变化的规律图,现将该电阻与阻值为50Ω的电阻R0组成如图(b)所示电路,电源电压为12V,当电流表的示数为0.2A时,热敏电阻的温度为()
A:10℃
B:30℃
C:60℃
D:90℃
世界上国家和地区最多的大洲是( )
根据句意及首字母提示完成单词
①The young man looked quite f____, but she couldn't remember his name.
② When Mr. Wang arrives, please ask him to go u____ for the meeting.
③ —I don't know what to wear at the party.
—I have no idea, e____.
④ Another two g____ are needed to keep people in the neighborhood safe.
⑤You mustn't drive up a street with a No E____ sign.
“破镜重圆”从物理知识的角度来说是____(填“能够”或“不能够”)实现.因为破镜断裂处绝大多数分子距离____,分子间的作用力____.
2a=48 3b=48
4d=48 5c=48
求出下面一组数的最大公因数和最小公倍数.