属于单代号网络计划的时间参数的是()。
A.ESi-j
B.ESi
C.EEi-j
D.EFi
E.Di
参考答案:B, D, E
Lady Gaga has put off her concerts because of the difficulties ______ by the ongoing strikes.
A.causing
B.to be caused
C.caused
D.to cause
患者女,15岁,荨麻疹病史1月,其皮损主要为()
A.红斑
B.丘疹
C.风团
D.结节
E.渗液