一根粗细均匀的电阻线,阻值为5Ω,若将它截去一半,然后均匀拉到原长,则此时电阻线

题型:选择题

问题:

一根粗细均匀的电阻线,阻值为5Ω,若将它截去一半,然后均匀拉到原长,则此时电阻线的电阻为(  )

A.大于5Ω

B.小于5Ω

C.等于5Ω

D.无法判断

考点:影响电阻大小的因素
题型:选择题
选词并用其适当形式填空。
peel, love, become, buy, shark, how much, want, talent, famous

1. Yesterday I saw many big _____ at the aquarium.
     They are terrible, and they eat small fish.
2. —I need some honey.
    —OK. _____ honey do you need?
    —Two teaspoons.
3. She could play computer games when she was two. 
    She is _____.
4. Could you _____ an apple for me?
5. Yao Ming is one of ______ basketball players.
    He plays basketball very well.
6. Gina _____ to be a computer programmer. 
    She studies English and math hard.
7. —Did you buy any souvenirs when you visited Suzhou?  
    —Yes. I _____ lots of souvenirs. They are interesting.
8. I want to be a singer, but my mother wants me to _____ an engineer.
9. His grandmother is _____. She often buys something
    delicious for her grandchildren.

题型:选择题

在异步串行的通信中,若要传送扩展ASCII码,则异步串行码字符格式的第8位数据( )

A.不传送
B.恒为0
C.恒为1
D.为有用数据

题型:选择题

有关使用堵漏毯的说法,下列正确的有()

①适用于舷外水线附近及以下船壳较平坦和一般弯曲部位,不适合首尾弯曲太大的部位;

②绒面朝向破洞,靠水压压紧;

③不可能将洞口堵严,只能减少进水量。

A.①、②;

B.①~③;

C.①、③;

D.②、③。

题型:选择题

可以诱发丹毒的是()。

A、营养不良

B、糖尿病

C、肾性水肿

D、足癣

E、运动

题型:选择题

小方坯连铸矫直一般采用()类型。

A.一点矫直

B.两点矫直

C.三点矫直

D.多点矫直

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