所有高温的管道、容器等设备上都应有保温。保温层应保证完整，当室内温度在25℃时，保温层表面的温度一般不超过50℃（）
参考答案：对
It is human activities on the earth that are to _______ global warming.
A．be blamed for
B．to blame for
C．take charge of
D．be responsible with
封闭的带式输送机地面（）上方宜设臵甲烷传感器。
