地区石油工程公司每（）组织开展1次井控工作例会。
A.年度；
B.半年；
C.季度；
D.月度。
参考答案：B
— She looks very happy. She ____ have passed the exam.
— I guess so. It's not difficult after all. [ ]
A. should
B. could
C. must
D. might
空分设备中实际应用的冷凝蒸发器的结构形式有哪些？
