Sometimes the processes in which people are engaged are dependent upon other processes being completed first, possibly by other people. For example, on an automobile (71) , it is necessary for the body to be constructed before the doors can be added on. Attempting to add the doors first would be pointless, because there would be nowhere to attach them. Thus, if there is no body ready to have doors added, the process for adding doors has to be (72) until the process for creating the next body is complete. This is known as (73)
Obviously, there are many cases where people have to wait for other people to do something. However, if everyone in such a situation is waiting for someone else to do something first, then no one will ever be able to do anything. When discussing processes, this situation is known as (74) , because all of the involved processes are effectively dead because of locks they have on resources. Usually someone in such a situation will eventually notice and abort the process, allowing normal flow to (75) , and often warning signs can even be spotted ahead of time to avoid ’it in the first place.

A．water thread

B．assembly thread

C．water line

D．assembly line

患者女，35岁，因“躯干、四肢红斑、风团，伴有关节疼痛及发热3d”来诊。8d前因感冒口服白加黑，3d前躯干、四肢出现红斑、风团，伴有关节疼痛及发热，体温最高39℃。曾口服马来酸氯苯那敏（扑尔敏）、西替利嗪及对乙酰氨基酚（扑热息痛），热可缓解，但皮疹不见消退。

最可能的诊断是（提示查体见周身散在的风团及色素沉着。）（）。

A.荨麻疹

B.荨麻疹性血管炎

C.丘疹性荨麻疹

D.成人Still病

E.药物超敏综合征

F.药物性皮炎