你可能感興趣的試題

單項選擇題

Electric insulation is made of organic substances and so gradually （） with age.

A.deteriorates
B.increases
C.are fouled
D.becomes better

單項選擇題

On commonly used ships,if two A√Cgenerators are operated in parallel, the load is distributed evenly by （）.

A.varying the D-Cexciter voltage
B.varying the reluctance of the air gap
C.regulating the speed of prime mover
D.shorting out part of the armature windings