下列对脾毗邻的描述中正确的是()A．膈面与膈相邻 B．脏面前上份与胃底相邻 C．前端

_____ that he isn't adequate to the present job, he devotes all his spare time to studying professional

knowledge. [ ]

A. Concern

B. To concern

C. Concerned

D. Concerning

My friend showed me round the town, _____ was very kind of him.  [ ]

A. which      

B. that      

C. where        

D. it

无结石性胆囊炎发生的主要原因是()

A．胆道蛔虫引起感染

B．胆汁淤滞

C．致病菌随血行扩散

D．迷走神经功能亢进

E．胆汁中胆固醇含量增加

破碎比是原料最大颗粒与（）最大颗粒之比。

水泥土搅拌法的主要施工步骤有哪些？