单项选择题

关于光电开关说法正确的是( )

A、光电开关实现将光信号变成电信号
B、光电开关实现将电信号变成光信号
C、按照接收器接收光的方式的不同,光电式接近开关可分为对射式、 反射式、 漫射式。
D、光电开关的信号线是棕色
相关考题

Short CoursesIn order to provide opportunities for indi...


单项选择题Short Courses

In order to provide opportunities for individual or group international students and visitors to improve Chinese language proficiency and acquire a better understanding of the present-day China and traditional Chinese culture, apart from the regular programs, Binhai Normal University also offers various short programs, such as Conversational Chinese, Traditional Chinese Keep-fit Sports, Chinese Music Instruments, Chinese Painting, Chinese Calligraphy, and Culture Activity and Trip.
The duration of programs can be from one week to three months. Summer Courses are from the end of June to the beginning of September; Spring Courses are in February, and March.
Registration fee: US $20. Tuition fee: US $320 for four weeks, US $70 for each additional week.
Accommodation fee: US $8-10/person/day for double rooms.
Food expenses: Fixed meals are arranged for students of short courses. The cost is US $8-10 per person per day.
Teaching materials fee: US $20 per term.
Date of application: Expires by the middle of January for spring short courses.
Expires by the end of June for summer short courses.
Contact Address:
International Education and Exchange Department
Binhai Normal University
Binhai, China
Tel: 86-999-3869405
Fax: 86-999-3839452
E-mail: waiban@mail.binhai.edu.cn
Website: http://www.binhai.edu.cn
Short courses
Short courses offered by【46】.
Short courses provided for【47】and visitors.
Reasons to offer short courses: improve Chinese language proficiency and know about【48】.
The maximum of duration of programs:【49】.
Expiration of the date of application of the summer courses: by【50】.