关于行政强制执行程序，下列说法正确的是（）A、催告程序是行政强制执行的必经程序 B、催

—You _______ be happy with the strong public support you've received.

—Yes,you're right.I'm really excited.[ ]

A. may

B. can

C. must

D. need

某同学在做“测定小灯泡的电功率”实验中，器材齐全、完好，电源由几节干电池组成（电压为1.5V的整数倍且保持不变），待测小灯标有“0.2A”字样，滑动变阻器标有“20Ω 2A”字样。

（1）他按图1连接电路，闭合电键S后，观察到电表的示数分别为1.3伏和0.16安，继续移动变阻器的滑片，发现两电表的示数均不发生变化，则其原因是________，电源的电压为______V。

（2）经过思考，该同学发现操作中的不当之处，重新正确连接电路进行实验。他移动变阻器的滑片，当电流表示数为________A时小灯泡正常发光，此时滑片的位置恰好在变阻器中点上，则小灯的额定功率为______W。

（3）该同学在移动变阻器滑片的过程中，若发现电压表的示数如图2所示，则与其正常发光的亮度相比，此时小灯的亮度情况是__________________。

下肢烧伤时，若膝关节后侧烧伤，膝关节应保持（）。

A.微屈5°～10°

B.微屈10°～20°

C.屈曲20°～25°

D.屈曲25°～35°

E.伸直位

The approach we propose is a system-oriented methodology for knowledge acquisition, this orientation emphasizes ongoing documentation throughout each cycle and technique applied. Program-wide documentation is suggested, both for the purpose of internal (91) and for later verification and (92) efforts. The documentation system we propose includes a central "knowledge acquisition (93) " which is (94) to reflect knowledge acquisition plans, session nodes, and domain expert participation. Specifically, (95) within the database system include knowledge acquisition forms, which document plans for, and notes from, knowledge acquisition session, domain expert file, and rule content forms.

A．dataset

B．collection

C．file

D．database

产后出血的最主要原因是（）。