什么是水当量？
参考答案：
单位时间内通过高炉某一截面的炉料或煤气升高（或降低）1℃所吸收（或放出）的热量为水当量。
The traffic police stopped three trucks heavily loading with merchandise that looked as grain bags.
A．that were loading...like B．loaded with...likeC．to load with...for D．loaded with...for
