问题 问答题 简答题

原子吸收光谱分析中灯电流的选择原则

答案

参考答案:

在保证放电稳定和有适当光强输出情况下,尽量选用低的工作电流。

单项选择题
阅读理解

阅读下列短文,从每题所给的四个选项(A、B、C和D)中,选出最佳选项。
A
Shakespeare's Birthplace and Exhibition of Shakespeare's World
Welcome to the world-famous house where William Shakespeare was born in 1564 and where he grew up. The property(房产)remained in the ownership of
Shakespeare’s family until 1806.The House has welcomed visitors traveling  from all over the word ,for over 250 years.
Enter though the Visitors’ Centre and see the highly-praised exhibition Shakespeare’s World, a lively and full introduction to the life and work of  Shakespeare.
Stand in the rooms-where Shakespeare grew up.
Discover examples of furniture and needle work from Shakespeare’s period.
Enjoy the traditional(传统的)English garden, planted with trees and flowers mentioned in the poet’s works.
pThe Birthplace is within easy walking distance of all the car parks shown on the map; nearest is Windsor Street(3 minutes’ walk).
The House may present difficulties but the Visitors’ Centre, its exhibition, and the garden are accessible(可进入的)to wheelchair user.
 The Shakespeare Coffee House (opposite the Birthplace).
ADMISSION:
Adult £4.90
Child £2.20
Family £12.0
(2 adults +up to 3 children)
OPENING TIMES:
20 Mar to 19 Oct
Mon to Sat: 9:00am to 5:00pm
Sun:9:30am to 5:00pm
20 Oct to 19Mar
Mon to Sat:9:30am to 4:00pm
Sun:10:00am to 4:00pm
OPENING TIMES:
20 Mar to 19 Oct
Mon to Sat: 9:00am to 5:00pm
Sun:9:30am to 5:00pm
20 Oct to 19Mar
Mon to Sat:9:30am to 4:00pm
Sun:10:00am to 4:00pm
 
小题1:. How much is the admission for a family of two grown-ups and two children?
A.$9.80B.$12.00C.$14.20D.$16.40
小题2: Where is the nearest parking place to Shakespeare’s Birthplace?
A.Behind the exhibition hall.
B.Opposite the Visitors’ Centre.
C.At Windsor street.
D.Near the Coffee House.
小题3: A wheelchair user may need help to enter         .
A. the House     B the garden    C. the Visitor’s Centre    D. the exhibition hall