皮皮学,免费搜题
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搜题
【单选题】
以下哪个物理量与转动无关
A.
力矩
B.
角动量
C.
加速度
D.
转动惯量
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举一反三
【单选题】有包装或放置在一般容器内的物品,其活性指数为( )。
A.
0
B.
1
C.
2
D.
3
【单选题】气固催化反应的内扩散模数 ,其中L为特征长度,若颗粒为球形则L=( )。
A.
厚度/2
B.
R
C.
R/2
D.
R/3
【多选题】螺杆预塑完成后进行松退的目的是()
A.
增大注射量
B.
防止物料的流涎
C.
降低喷嘴流道的压力
D.
增大注射压力
E.
减小注射速度
【单选题】All I suggest is that we ________electric wires out of the reach of children.
A.
keep
B.
to keep
C.
kept
D.
be kept
【单选题】What is not mentioned as a proper way to keep the electric wires?
A.
They should be kept clean.
B.
They should be kept dry.
C.
They should be in sufficient length.
D.
They should not be overloaded.
【简答题】In an electric lamp there should not be any oxygen in which the wires may burn away.
【单选题】气固催化反应的内扩散模数 ,其中L为特征长度,若颗粒为圆柱形则L=()。
A.
厚度/2
B.
R
C.
R/2
D.
R/3
【单选题】Electric wires in your house are ___________ with poor conductors like rubber or silk.
A.
segregated
B.
insulated
C.
isolated
D.
served
【单选题】气固催化反应的内扩散模数 ,其中L为特征长度,若颗粒为平片形则L=()。
A.
厚度/2
B.
R
C.
R/2
D.
R/3
【判断题】Electricity comes into our houses by flowing through electric wires and cables in the sky.
A.
正确
B.
错误
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