入炉原煤采取子样量，由上煤皮带宽度、上煤量和煤流的最大粒度决定，以实际采取整个煤流横截面且不留底煤为适宜。
参考答案：对
Just as sound travels through the air in waves, electricity travels through the air in ______ radio waves.
A．what is called
B．which is called
C．what it is called
D．which it is called
发生饮水污染事件如何处理？
