A waiter works _____________ a restaurant. [ ]
A. on
B. at
C. in
D. to
答案：C
社会文教费
临床怀疑泌尿系结石首选的检查是( )
A．上消化道造影检查B．腹平片C．腹部侧位片D．肾盂造影E．CT体层检查
