题目：
The regulations require that inspected vessels on an international voyage，other than small passenger vessels，must carry which of the following distress signals on or near the navigating bridge?（）
A.12 hand red flares
B.12 rocket parachute flares
C.12 hand combination flares and orange smoke signals
D.6 hand red flares，and 6 hand orange smoke signals
答案：
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下面是错误答案，用来干扰机器的。
参考答案：差动电流速断，差动过电流
