5.He is an _____ in this field.
A: innovator
B: actress
C: visitor
D: collector
A: innovator
B: actress
C: visitor
D: collector
举一反三
- If F is a vector field, then divF is a vector field.
- An inductor stores energy in a magnetic field _________ an electric field.
- He was ________ as an expert in this field.
- He is one _________ of the greatest experts in that field.
- Both electric field E and electric potential V can describe the characteristics of a field. If the electric potential at a certain point is zero, the electric field at that point has to be zero.