How time flies! Three years really a short time. [ ]
A. is
B. are
C. was
D. were
答案:A
急性胰腺炎时血清脂肪酶()
A.起病后6~12小时升高,48小时下降,持续3~5天
B.起病后12~14小时升高,下降缓慢,持续1~2周
C.起病后24~72小时上升,持续7~10天
D.降低程度与临床症状平行
E.起病后3~4小时上升,12小时高峰,24小时下降
装岩机的尾轮悬挂位置应比岩碴堆高()m。
A.0.5~1
B.0.8~1
C.0.7~1
D.0.9~1.2