夏季荷花盛开，为了便于游客领略“人从桥上过，如在河中行”的美好意境，某景点拟在如图所示的长方形荷塘上架设小桥．若荷塘周长为250m，且桥宽忽略不计，则小桥总长为____  m．

要使质量分数为10%的氯化钠溶液100g 变成质量分数为20%的氯化钠溶液，可采取的方法是（　　）

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ESL TEACHER NEEDED IN SHANGHAI

Date updated：Oct 6，2016

Employer：Longman schools, Shanghai

Qualifications

·A genuine interest in children, teaching, and professional development

·Open-minded, an adventurous spirit, and professional flexibility

·4-year bachelor's degree from an accredited university

·Native English speaker

·Passport issued by the USA, Canada, the UK, Ireland, Australia, and New Zealand

·Two years post bachelor degree teaching experience preferred

·Internationally recognized TEFL, CELTA, or TESOL certification

·Experience traveling internationally and / or working abroad preferred

Responsibilities

·Planning and delivering lessons to learners (ages 3.15)

·Using electronic media and courseware to teach English efficiently and effectively

·Evaluating student progress and providing ongoing guidance for improvement

·Participating in social activities with students organized by your school

·Maintaining regular office hours

Employment package

·Salaries：13,000rmb-16,000rmb per month (depending on experience)

·6,000 rmb sign on bonus (after probation — a time of training and testing when you start a new job)

·10，000rmb Accommodation Assistance Loan (overseas applicants only)

·2,000rmb relocation allowance (overseas applicants only)

·16 teaching hours and 10 office hours per week

·2 Day off per week

·Paid overtime for teaching

·Paid holiday & paid Chinese public holiday

·15-month Z working visa (foreign expert certificate)

·5000rmb flight allowance (paid upon contract completion)

·Comprehensive health Insurance & accident Insurance

·Accommodation assistant

·On-going professional teacher development and training program

·15 month contract (including 3 month's probation)