确定颅内高压的X线诊断依据是（）
A.颅缝增宽
B.蝶鞍缩小
C.脑回压迹减少
D.颅骨骨质吸收
E.颅骨骨质硬化
参考答案：A
I was on the highway when his car went past, followed by a police car. They _____ at least 150km
an hour.[ ]
A. should have been doing
B. would have done
C. could have done
D. must have been doing
在氯霉素滴眼剂处方中，下列物质的作用是：氯化钠（）。
A．渗透压调节剂
B．抑菌剂
C．抗氧剂
D．金属离子络合剂
E．PH调节剂
