Passage Two
Welcome to North Road Medical Centre! 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 medical 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 0r 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 telephone.Most visits by doctors are made between12 noon and 3 p.m．If you are able to phone before 11a.m., this helps us to plan the day．
When do most doctors go for a home visit?
把10gMgCl2和MgSO4的混合物溶于适量水中，滴加2mol／L的BaCl2溶液至沉淀完全，共消耗BaCl2溶液25mL。求混合物中MgCl2和MgSO4的质量各是多少克
固定在匀强磁场中的正方形导线框abcd，各边长为1．其中ab是一段电阻为R的均匀电阻丝，其余3边均为电阻可忽略的铜线。磁场的磁感应强度为B，方向垂直纸面向里。现有一与ab段的材料、粗细、长度都相同的电阻丝PQ架在导体框上，如图所示。PQ以恒定速度方向如何
一小物块以速度v0=10m／s沿光滑地面滑行，然后沿光滑曲面上升到顶部水平的高台上，并由高台上飞出，如图所示。问当高台的高度h多大时，小物块飞行的水平距离最大这个距离是多少(g=10m／s2)
某晶体盐的水溶液呈浅绿色，在此溶液中通入氯气，溶液变为棕黄色，把所得棕黄色溶液分成两份：一份加入KSCN溶液，溶液变深红色；另一份加入BaCl2溶液，产生不溶于稀HNO3的白色沉淀，则该晶体盐的化学式是_______。
欲除去乙烷中的乙烯，可将混合气体通过盛有_______的洗气瓶；欲除去乙炔中的硫化氢，可将混合气体通过盛有_______的洗气瓶。
浓硝酸常盛装在棕色瓶中，且贮放在冷暗处，原因是_______，
碳酸氢钠溶液和烧碱溶液反应的离子方程式为_______。
常温下，氨水中存在的离子有_______。
在酸或碱存在的条件下，甲酸甲酯跟水发生水解反应的化学方程式为_______。
有下列几种气体：H2、O2、HCl、NO、NH3、CH4，其中通常情况下能用来和水做“喷泉”实验的是_______。
