催化裂化装置开工时，分馏塔各路循环要充油的目的之一是（）。
A.使泵上量建立循环
B.防止冲塔
C.防止淹塔
D.使塔内建立液位
参考答案：A
—Can all the donation be delivered to the earthquake-stricken area?
—Hard to say. Even if only 1% can reach them, I am still glad to do it, as the saying goes, “ ”.
A．The more, the better
B．Easier said than done
C．Better late than never
D．Better than nothing
肝素抗凝血的主要作用机制是
A．增加抗凝血酶Ⅰ的活性
B．增加抗凝血酶Ⅲ的活性
C．去除Ca2+
D．促进纤维蛋白溶解
E．抑制血小板的作用
