治疗慢性泄泻，宜选用的穴位是
A．内关、足三里、中脘B．天枢、足三里、神阙C．天枢、阴陵泉、上巨虚D．天枢、丰隆、气海
参考答案：B
He was sitting there ________ his cigarette. Without any words, he seemed to be ________ deep
thought. [ ]
A. at; in
B. over; in
C. with; at
D. with; over
天然气的视临界温度计算公式为（）。
A.
B.
C.
D.
