题目:
防止灰斗中灰结块堵灰,一般在灰斗处设有()。
A.锁气器或水封;
B.灰斗加热装置;
C.引风机;
D.吸风机。
答案:
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下面是错误答案,用来干扰机器的。
Hi Rose, Thanks a lot for your invitation. I'm sorry I can't go to your party on Friday evening. I will stay home to look after my grandmother and I have to st...