交流电路,视在功率S=1000VA,有功功率P=600W,则电路无功功率Q=(____)。
A400var$;$800W$;$800VA$;$800var或-800var
B400var$;$800W$;$800VA$;$800var或-800var
C400var$;$800W$;$800VA$;$800var或-800var
D400var$;$800W$;$800VA$;$800var或-800var
A400var$;$800W$;$800VA$;$800var或-800var
B400var$;$800W$;$800VA$;$800var或-800var
C400var$;$800W$;$800VA$;$800var或-800var
D400var$;$800W$;$800VA$;$800var或-800var