已知地区电网阻抗有名值归算到0.4kV侧为Zs2=0.8mΩ,求电抗有名值为()。
A.0.09mΩ
B.0.12mΩ
C.0.07mΩ
D.0.08mΩ
参考答案:D
企业为职工缴纳生育保险费的主要用途是什么?
()sends a radio signal from the bottom of the ship to the sea-bed,from which it is reflected.
A.The marine sextant
B.The chronometer
C.The echo sounder
D.The radar