输煤系统的粉尘叫做具有爆炸危险的粉尘,与粉尘爆炸危险性有关的因素是()。
A.粉尘的浓度、粒度和温度;
B.粉尘的浓度;
C.粉尘的粒度和湿度;
D.粉尘的浓度和粒度。
参考答案:B
听句子,缩写原文。()
A.I shall give you a discount.
B.The crisis is affecting the whole world.
C.I shall come in my Sunday best.
D.The price is still too high.
烟支切割鼓轮的浮圈装置,在未装滚轮臂时,浮圈内缘与槽缝中心的距离为烟支长度加()mm。
A、6
B、7
C、8
D、9