目前酸化常用无机酸的种类及各自的条件是什么?
参考答案:
⑴目前酸化常用无机酸主要有盐酸、土酸两种。
⑵盐酸适用于灰岩和白云岩地层。
⑶土酸适用于砂岩和泥质砂岩地层。
Judging from his face_______ there was a confident smile, we knew that he didn't lose heart. [ ]
A. in which
B. from which
C. by which
D. on which
患者李某。胃部隐隐作痛。遇寒、饥饿、饮食生冷则疼痛加重,按之则舒,温熨,进食可使疼痛缓解。
若上证失治或误治,寒邪偏甚,症见胃脘疼痛加剧,呕吐肢冷,可选用何方治疗()
A.大建中汤
B.香砂六君子汤
C.黄芪建中汤
D.六君子汤
E.以上都不是