植物发病的原因叫作() ["病原","病害","病害流行","再侵染"]
国际航行船的货船构造安全证书、客船安全证书的换证检验属于下列哪种检验(). ["船级检验","临时检验","法定检验","特别检验"]
M5配电箱和机房内的温度由一个温度传感器监控。如果机器内的温度超过()℃,则机器停机并显示故障信息。 ["30","40","50","60"]
面包醒发温度一般为() ["30℃左右","38℃左右","45℃左右","25℃左右"]
装连续式机车信号的列车,遇通过信号机灯光(),而机车信号显示进行的信号时,应按机车信号的显示运行。 ["熄灭","亮红灯","亮绿灯","亮黄灯"]
沟通的分类?