题目

如图是双缝干涉实验装置的示意图，S为单缝，S1、S2为双缝，P为光屏．用绿光从左边照射单缝S时，可在光屏P上观察到干涉条纹．下列说法正确的是( )．A.减小双缝间的距离，干涉条纹间的距离减小B.增大双缝到屏的距离，干涉条纹间的距离增大C.将绿光换为红光，干涉条纹间的距离减小D.将绿光换为紫光，干涉条纹间的距离增大 It’s located at the western gate, just beside the ticket center.  The center provides a series of services, such as guide service, free water supply, guide books, charging mobile phones, baby carriage, first-aid medicine, and simple health care. You can also buy some souvenirs like stamps, postcards and tiger toys.         It’s located at the eastern and western gates of the Pearl Spring Scenic Area. There are all kinds of tickets, such as tickets for the scenic area and tickets for amusement park.Dingshan Pavilion Dining Hall, a large-scale dining centre, can receive 300 people for dining at the same time. It lies in the Scenic Area. Tourists can enjoy the beautiful scenery while eating. It’s open from 8 a.m. to 8 p.m. every day. Transportation Guide You can take No. 168 bus from Gulou Bus Stop and get off at Pearl Spring Bus Stop. The bus stop is just outside the Scenic Area. You can also drive here.【小题1】According to the leaflet, visitors can ______ at Tourist Service Centre.A．take a bus B．buy a ticketC．get guide booksD．have snacks【小题2】Dingshan Pavilion Dinning Hall ______.A．is a large-scale dining centreB．is located next to the Ticket Centre C．is open to the public 16 hours a day D．can receive 300 people for dinner in a day【小题3】Visitors to the Scenic Area can ______. A．only take a bus there B．get water for free if they are thirstyC．have one choice if they want to buy tickets D．sell souvenirs, such as stamps and postcards