在煤矿井下，防爆型煤矿安全监控设备之间的输入、输出信号必须为本质安全信号。
参考答案：对
My dress __ very nice . I like color, but it is too long .[ ]
A. looks , it's
B. looks , its
C. looks , his
寒湿困脾证与湿热蕴脾证的共同症状是()
A.身热不扬
B.脘腹胀闷
C.面黄不泽
D.口中黏腻
E.白带量多
