糖尿病早期诊断最有意义的是（）。
A.多食、消瘦
B.多饮、多尿
C.空腹血糖升高
D.皮肤瘙痒
E.尿糖阳性
参考答案：C
The prices _____ up all the time and no one knows when it will become stable. [ ]
A. had gone
B. have been going
C. have gone
D. had been going
同一交流回路的导线必须穿入（）管内，管内导线总面积不应超过管子总面积的（）。
