單項(xiàng)選擇題
A.3~1km B.10~3km C.15~5km D.50~20km
A.0.02s B.0.05s C.0.1~0.25s D.0.25~0.5s
A.δu=u1-△u1 B.δu=δu1+e-∑△u C.δu=δu1+e-∑△u D.δu=δu1+e-(δu11+△uT+δu12)
A.蓄電池裝置 B.靜止型不間斷供電裝置UPS(UninterruptedPowerSupply) C.應(yīng)急電源裝置EPS(EmergencyPowerSupply) D.機(jī)械儲(chǔ)能電機(jī)型不間斷供電裝置
A.G1級(jí) B.G2級(jí) C.G3級(jí) D.G4級(jí)
A.23% B.19% C.17% D.11%
A. B. C. D.
A.0V B.5~15V C.30~50V D.60~100V
A.15% B.9.3% C.8.8% D.6.8%
A.2.6m B.3.0m C.3.5m D.4.0m
A.應(yīng)不大于0.5m3 B.應(yīng)不大于13 C.應(yīng)不大于1.53 D.國(guó)標(biāo)無(wú)硬性要求