The resistance of electric wire will decrease as its （）

A . directly as its length and inversely as its cross-sectional area B . inversely as its length and directly as its cross-sectional area C . directly as its length and directly as its cross-sectional area D . inversely as its length and inversely as its cross-sectional area

A、opposes any change in the applied voltage B、opposes any change in the current flow through the circuit C、aids any changes in the applied voltage D、aids any changes in the current through the circuit

A . increases by the square of the original value B . increases C . remains the same D . decrease

A . Power factor B . Power ratio C . compression ratio D . Compression factor

A . hogging stresses B . sagging stresses C . racking stresses D . shearing stresse

A . The voltage drop across each resistor is the same B . The total current flow equals the reciprocal of the sum of the individual currents C . The total resistance equals the sum of the individual resistances D . The total voltage equals the sum of the individual voltages across each resistance

A . larger than the greatest branch resistance B . smaller than the lowest branch resistance C . equal to the sum of the individual branch resistances D . one-half the sum of the individual branch resistance

A . The total current flow equals the sum of the individual currents B . The total current flow equals the reciprocal of the sum of the individual currents C . The total resistance equals the sum of the individual resistance D . The total voltage equals the sum of the individual voltages across each resistance

A . pressure B . velocity C . gravity D . viscosity

A、bridge control panel B、disconnect links C、governor relay box D、main switchboard

A . ampere B . volt C . watt D . ohm

A . Carbon dioxide B . Distilled water C . Fresh water D . Salt water

A . develop torque B . generate high voltages C . produce a magnetic field D . generate high electrical resistance

A . Globe valve B . Butterfly valve C . Gate valve D . Packless valve

A . reduce B . rise C . raise D . fall

A . Frequency meter B . Ohmmeter C . Induction voltage regulator D . Current transformer governor

A . Ⅰ+Ⅱ B . Ⅱ+Ⅲ C . Ⅲ+Ⅳ D . Ⅰ+Ⅳ

A . low voltage trip to trip B . reverse power trip to trip C . damage to windings D . excessive exhaust temperature

A.The total current flow equals the sum of the individual currents B.The total current flow equals the reciprocal of the sum of the individual currents C.The total resistance equals the sum of the individual resistance D.The total voltage equals the sum of the individual voltages across each resistance

A．protective foliage B．thick bark C．genetic makeup D．tainted air 此题为多项选择题。

A.larger than the greatest branch resistance B.smaller than the lowest branch resistance C.equal to the sum of the individual branch resistances D.one-half the sum of the individual branch resistances