If a well is damaged, then the skin factor S will be_______ .
A: negative
B: positive
C: zero
D: changed
A: negative
B: positive
C: zero
D: changed
举一反三
- The sign bits (S) indicate if the temperature is positive or negative: for positive numbers S = 0 and for ______ numbers S = 1. A: negative B: zero C: positive
- 斜率（负、正、零）【slope（negative，positive，zero）】
- If the current direction of each mesh is the same, the mutual resistance of each mesh equation ( ). A: is always negative B: is always positive C: is always zero D: can be positive or negative
- The work done by static friction can be: A: Positive B: Negative C: Zero D: Any of the others
- The flux of electric field intensity E through a closed surface is equal to zero, which means in the surface A: there are more positive charges than negative charges. B: there are more negative charges than positive charges. C: there are the same quantity of the positive charges and negative charges. D: there is no polarized chargeharge.