下列关于实体集语法说法错误的是______。A．IDEF1X用椭圆形来表示独立实体集

三视图的主视图、侧视图、俯视图分别是从几何体的 ______、______、______观察几何体画出的轮廓线，画三视图的基本要求是 ______和 ______高度一样； ______和 ______长度一样； ______和 ______宽度一样．

根据《医疗用毒性药品管理办法》的规定，当事人对处罚不服的，可在接到处罚通知之日起（）内，向作出处罚决定机关的上级机关申请复议。（）

A.10日

B.15日

C.25日

D.30日

味红茶品饮时，即使在茶汤中加入多种调料，尤其是一些（），香气和滋味是不会轻易被混淆的。

A.小叶种红茶 

B.大叶种红茶 

C.名优红茶 

D.进口红茶

当零件单一方向具有圆、半圆、圆角、曲线及其他复杂形状时，采用（）作图最为方便。

A.正等测轴测图

B.斜二测轴测图

C.主视图

D.剖视图

When the system upon which a transport entity is running fails and subsequently restarts,the(21) information of all active connections is lost. The affected connections become half-open, as the side that did not fail does not yet realize the problem.The still active side of a half-open connections can close the connection using a(22)timer. This timer measures the time the transport machine will continue to await an (23) of a transmitted segment after the segment has been retransmitted the maximum number of times.When the timer (24),the transport entity assumes that either the other transport entity or the intervening network has failed. As a result, the timer closes the connection, and signals an abnormal close to the TS user. In the event that a transport entity fails and quickly restarts, half-open connections can be terminated more quickly by the use of the RST segment, the failed side returns an RST i to every segment i that it receives. When the RST i reaches the other side, it must be checked for validity based on the (25) number i, as the RST could be in response to an old segment. If the reset is valid, the transport entity performs an abnormal termination.

空白处（25）应选择（）

A.sequence

B.acknowledgment

C.connection

D.message