如图所示，虚线框abcd内为边长均为L的正形匀强电场和匀强磁场区域，电场强度的大

某发光点S所发出的两条光线经平面镜反射后形成的光线如图所示，请完成光路图并确定发光点S的位置．

油罐检尺应检（）次，并且相差不得超过（）毫米。

根据赫塞和布兰查德，成熟度包含了（）

A.领导者的动机

B.追随者的年龄

C.追随者的权力

D.追随者承担责任的能力和意愿

Microsoft's COM is a software（1）that allows applications to be built from binary software components. COM is the underlying architecture that forms the foundation for higher-level software services, like those provided by OLE.COM defines a binary standard for function calling between components,a way for components to dynamically discover the interfaces implemented by other components,and a mechanism to identify components and their interfaces uniquely. OLE is a compound（2）standard developed by Microsoft.OLE makes it possible to create（3）with one application and link or embed them in a second application.Embedded objects retain their original format and（4）to the application that created them.Support for OLE is built into the Windows and MacOS Operating Systems.A（5）compound document standard developed mainly by Apple and IBM is called OpenDoC.

空白（2）处应选择（）

A.text

B.graphic

C.document

D.database

均流器的主要作用是什么？