煤刮板机在电厂输煤系统中，大多用来作为（）。
A.给、配煤设备；
B.煤场设备；
C.卸煤设备；
D.输送设备。
参考答案：A
-- Can you guess _________ the new Nike sports shoes?
-- Yes, Maybe he asked his grandpa to pay for them, I think.
A．how he paid for
B．where he bought
C．when he paid for
D．why he bought
“矮胖”型高炉和多风口，有利于顺行，并有利于（）
A.强化冶炼
B.高炉长寿
C.降低焦比
D.提高鼓风动能
