电炉丝通电一段时间后热得发红,而连接电炉丝的导线却不怎么热,这主要是因为( )

题型:选择题

问题:

电炉丝通电一段时间后热得发红,而连接电炉丝的导线却不怎么热,这主要是因为(  )

A.导线的绝缘皮隔热

B.导线的电阻远小于电炉丝的电阻

C.导线散热比电炉丝快

D.通过导线的电流小于通过电炉丝的电流

考点:焦耳定律的变形公式的应用
题型:选择题

My name is Xue Yan. My home is in Shanchong, Changtai. Do you know where it is? It’s in Zhangzhou. It’s very nice and clean. There are many beautiful flowers and delicious strawberries(草莓) there. The air is very fresh and the trees are green.

Our house is in the middle of Shanchong village(村庄). Behind our house there is a big old tree. My grandfather tells me that the tree is very, very old. There are many birds in the tree. We call it a “bird tree”. Our house is near a mountain(山). There are a lot of animals on the mountain. After school, I often go there and pick some fruit(水果). It is very interesting.

根据短文内容,判断正(T)误(F)

小题1:Xue Yan is from Fujian.

小题2:Her parents are not mentioned(提到) in the passage(短文)。

小题3:Xue Yan’s house is behind the “bird tree”.

小题4:Xue Yan doesn’t like picking fruit on the mountain.

小题5:In Chinese, the word “pick” means “采,摘”

题型:选择题

急性肺水肿有呼吸抑制时禁忌()

A.高流量吸入乙醇湿化氧

B.四肢轮扎,阻断静脉回流

C.静脉缓慢注射稀释的氨茶碱

D.皮下注射吗啡

E.静脉注射呋塞米

题型:选择题

亚欧大陆桥运输是指国际集装箱从东亚、东南亚国家或地区由海运或陆运进入我国口岸,再经公路运往蒙古、欧洲、中东等国家和地区或相反方向的过境运输。()

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局域网交换机

题型:选择题

下面的固定方法渗透力强,3mm的组织1小时即可固定的是()

A.Rossman液

B.Mfiller液

C.Orth液

D.B-5固定液

E.Carnoy液

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