某 三 相 电 路 的 三 个 线 电 流 分 别 为 i A = 18 sin ( 314 t + 23 ° ) A , i B = 18 sin ( 314 t - 97 ° ) A , i C = 18 sin ( 314 t + 143 ° ) A ,当 t = 10 s 时,这 三 个 电 流 之 和 为 ( ) 。
A.
18A
B.
10A
C.
0A
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