分馏法原油稳定装置加热炉出口温度下降可能是由于（）。
A.进料量减少
B.稳前原油泵抽空
C.原油两个进口阀开度不均
D.燃料气量减少
参考答案：D
In relation to the jurisdiction rules under the Civil Procedures Law of China:
(a) Explain the term jurisdiction by forum level, and general rules under jurisdiction by forum level. (3 marks)
悬挑长度为1.5m、混凝土强度为C30的现浇阳台板，当混凝土强度至少应达到（）时方可拆除底模。
A.15N／mm2
B.22.5N/mm2
C.21N/mm2
D.30N／mm2
