英语语法分析

Monotube boiler should be installed with medium high temperature alarming and water shortage protect device.

直流锅炉应有中间点温度高警报和断水保护装置。

The monotube infrared transceiver circuit of the utility model can realize the functions of transmitting and receiving only through one infrared tube, with low cost and small structural space.

使用本实用新型所述的单管红外发射接收电路，通过只使用一个红外管便可实现发射和接收功能，成本低廉，所需结构空间小。