哪项检查前需要做碘过敏试验,检查后要严密观察腹痛和腹部体征()
A.静脉胆道造影
B.口服胆囊造影
C.经皮肝穿刺胆道造影
D.经内镜逆行胆胰管造影
E.B超
参考答案:C
We are working ______ to get the work done on time. There is only one day left before it must be finished. [ ]
A. at present
B. like crazy
C. as usual
D. from time to time
曲轴轴颈表面擦伤或腐蚀后应()修理。
A.钳工
B.车削
C.磨削
D.不必