参考下面代码,若要求 SCI2 正确接收数据后进行数据回传,接收错误后由 SCI1 发送数组 alarm[] 中的 1 个字节数据,则( 1 )( 2 )( 3 )处应该分别填入() mSCIReflag = SCIReN(SCI_NUM_2,1,SerialBuff); if ( ( 1 ) ) { ( 2 ) } else { ( 3 ) } A. mSCIReflag == 0 ; SCISendN(SCI_NUM_2,1,SerialBuff); ; SCISendN(SCI_NUM_1,1,alarm); B. mSCIReflag == 0 ; SCISendN(SCI_NUM_1,1,alarm); ; SCISendN(SCI_NUM_2,1,SerialBuff); C. mSCIReflag != 0 ; SCISendN(SCI_NUM_2,1,SerialBuff); ; SCISendN(SCI_NUM_1,1,alarm); D. mSCIReflag != 0 ; SCISendN(SCI_NUM_1,1,alarm); ; SCISendN(SCI_NUM_2,1,SerialBuff);