单项选择题
A.38000km/s,380km B.283km/s,22.8km C.14200km/s,14.2km D.283000km/s,283km
A.20i+32j B.20i+18j C.16i+16j D.10i+18j
A.398Ω,1.074×10-3/km B.398∠-5°Ω,1.074×10-3∠84.2°/km C.199Ω,22.5×10-3/km D.1.074∠-9.4°Ω,39.8∠94.6°/km