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【简答题】
感应电场是由 产生的,它的电场线是 。
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【简答题】We assume that A is large, which it must be for a well-designed circuit(电路).
【多选题】for single large plane wall, we commonly assume the heat conduction meets the following conditions .
A.
Steady state
B.
One-dimention
C.
Constant thermal conductivity
D.
No heat generation
【单选题】一生产线生产的产品成箱包装,每箱的重量是随机的,假设每箱平均重50kg,标准重为5kg。若用最大载重量为5吨的汽车承运,试用中心极限定理说明每车最多可装()箱,才能保障不超载的概率大于0.977。
A.
98
B.
99
C.
100
D.
101
【多选题】For single large plane wall, we commonly assume the heat conduction meets the following conditions .
A.
Steady state
B.
One-dimention
C.
Constant thermal conductivity
D.
No heat generation
【简答题】一生产线生产的产品成箱包装，每箱的重量是随机的。假设每箱平均重50千克，标准差为5千克。若用最大载重量为5吨的汽车承运，试利用中心极限定理说明每辆车最多可以装多少箱，才能保障不超载的概率大于0．977(Ф(2)一0．977，其中Ф(x)是标准正态分布函数。)
【单选题】You can assume that if all the females in a large pack had pups, ______.
A.
only the father would help feed them
B.
lions would find and kill them
C.
the mothers would fight each other
D.
most of the pups would starve
【多选题】For multi-layer large plane wall, we commonly assume the heat conduction meets the following conditions .
A.
Constant thermal conductivity.
B.
No heat generation.
C.
One-dimention and steady-state
D.
Perfect interface contact
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