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多媒体技术具有多样性 、（　　　）、交互性、实时性和数字化等主要特点。

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单项选择题
建筑热水供应的有关规定以下错误的是( )。
A.升温后的冷却水均不得作为生活用热水
B.水质符合《生活饮用水卫生标准》的升温后的冷却水，可作为生活用热水
C.太阳能、电能、燃气、蒸汽宜作为局部热水供应系统的热源
D.生活热水水质的卫生标准，与《生活饮用水卫生标准》相同
单项选择题
Welcome to North Road Medical Center! We are open from 8:30 a. m. until 6 p. m.Monday to Friday. Appointments(预约) with the doctors and nurses are acceptable both morning and afternoon. However, a same-day appointment may not necessarily be with your usual　doctor. Patients may be seen by any member of the team.
If you decide to register(注册) with us, please speak to one of our receptionists( 接诊员 ). You will need to complete a registration form. Each new patient is asked to answer some medi- cal questions. You should also make an appointment to see one of the nurses for a health check soon after registering. There is sometimes a delay in handing over medical records from your
earlier doctor, and this appointment gives us valuable information about your health.
The Out of Hours Service is reachable from 6:30 p. m. until 8 a.m. Monday to Friday;at　weekends from 6 : 30 p.m. Friday to 8 a.m. Monday. Telephone 0845 - 345 - 8995 to talk to　the Out of Hours Service. They will have a doctor get in touch with you.
For medical advice, you can call NHS Direct(24 hours)on 0845 -4647 or through the Internet at www. nhsdirect, nhs. com. You can always get advice over the telephone.
If you are too ill to come to the medical center, you can ask for a home visit over the tele- phone. Most visits by doctors are made between 12 noon and 3 p. m. If you are able to phone　before 11 a. m. , this helps us to plan the day.
If you need the help of the Out of Hours Service, you may
A.telephone0845-4647
B.call0845-345-8995
C.visittheNHSDirectwebsite
D.getintouchwithadoctor
单项选择题
先张法施工中，待混凝土强度达到设计强度的( )时，方可放松预应力筋。
A.70%
B.75%
C.80%
D.85%
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