在满足银幕亮度条件下，提高数字放映机氙灯功率设置反而会降低氙灯的寿命。通过透镜焦点的

诊断中毒性疾病的重要依据是（）

A.病史调查

B.临诊症状

C.病理诊断

D.动物试验

E.治疗性诊断

如图是实验室新采购的一批碳酸钠药品的标签。小明取13．25 g这种碳酸钠药品与盐酸反应，化学方程式为：2HCl + Na₂CO₃=" 2NaCl" + CO₂ ↑+ H₂O

用含HCl  7．3 g 的盐酸与它恰好完全反应。计算：

（1）13．25g 样品中Na₂CO₃的质量是多少？ 

（2）通过计算判断样品Na₂CO₃的含量是否符合标签要求。

某单位决定对4个部门的经理进行轮岗，要求每位经理必须轮换到4个部门中的其他部门任职，则不同的轮岗方案有

A．3种

B．6种

C．8种

D．9种

E．10种

在喷涂硝基漆或其他发挥性、易燃性溶剂稀释的涂料时，严禁使用（）。

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.0
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.

A. resetB. acknowledgment C. sequence D. synchroizer