风险估计的方法包括风险概率估计方法和风险( )方法两类。
A．估算排查B．估计核算C．影响估计D．主观淘汰
参考答案：C
At the beginning of class, the noise of desks _____ could be heard outside the classroom. [ ]
A. opened and closed
B. to be opened and closed
C. being opened and closed
D. to open and close
诊断急性胰腺炎的主要依据是（）。
A.肝功能检查
B.血尿淀粉酶
C.B超
D.临床表现
E.WBC升高
