皮皮学，免费搜题
登录
搜题
【简答题】
下图所示为焦距仪测量透镜焦距的光学系统图，1为平行光管物镜，2为被测透镜，3为β=-1的显微物镜，4为视放大率为10倍的目镜。平行光管物方焦平面上两直线之间距离2y为20mm，现测得被测透镜像方焦平面上2y' 2 =10mm。目镜所成像2y' 4 在明视距离处，眼睛瞳孔位在目镜像方焦平面上。试求：
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】You are upgrading a computer from Windows 98 to Windows 2000 Professional. The computer is a 400-Mhz Pentium III, and has 128 MB of RAM and a 10-GB hard disk. You are performing the installation by us...
A.
Remove the virus checker in Windows 98.
B.
Disable the BIOS virus checker and restart the computer.
C.
Run Fixmbr.Exe from the Windows 2000 Professional CD-ROM.
D.
Modify the Boot.ini file to include a signature parameter on the ARC path of the system partition.
【单选题】听力原文：M: Hi, Mary. Do you want to start writing a lab report after we finish this experiment? W: I can't. In fact I need to finish early because I'm going over to the psychology department to talk to P...
A.
A chemistry assignment.
B.
A study that their chemistry professor did.
C.
A class that the woman is taking.
D.
A job possibility.
【简答题】It is much ________ (ease) for you to use a computer if you know English.
【单选题】If you are a computer vendor in the 1990s, you'll
A.
sell complete computer systems to your customers
B.
sell vehicles with printers and fax machines built in to your customers
C.
sell. more centralized computers to your clients
D.
provide excellent service after sales to your customers
相关题目：