单项选择题
A.Switches B.panels C.alarm units D.safety devices
Electric insulation is made of organic substances and s...
单项选择题Electric insulation is made of organic substances and so gradually （） with age.
A.deteriorates B.increases C.are fouled D.becomes better
On commonly used ships,if two A√Cgenerators are operate...
单项选择题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
Moisture in a D-Cmotor would cause （）.A.short circuitB....
单项选择题Moisture in a D-Cmotor would cause （）.
A.short circuit B.speed up C.slow down D.hunting
