以下哪些设备可以提供VDSL业务接入？（） A.MA5100 B.MA5103 C.

Children get tired of learning often because they _____ to do better than they can, both at school and at home. [ ]

A. hope

B. are hoped

C. expect

D. are expected

On Monday, Khalid said to Rizwan, ‘I will sell you my boat for Rs.20,000·00 if it rains before 1.00 pm on Friday’. Rizwan agreed and paid Rs.10,000·00 in advance. On Friday afternoon, rainfall started at 1.15 pm. Rizwan is ready to pay the remaining Rs.10,000·00 to buy the boat, but Khalid is not willing to deliver the boat.Required:In relation to the law of contract, advise Khalid and Rizwan as to their mutual rights and obligations. (10 marks)

面对面拜访的场所有哪些？（）

A.客户住所

B.办公室

C.会议室

D.店铺中

E.社交场合

男性，67岁，慢性咳嗽、咳痰20余年，进行性气急加重5年。1周前因感冒后病情恶化入院。血气分析（呼吸空气）示：pH7．30，PaCO₂28．6kPa（65mmHg），PaO6．4kPa（48mHg）。当即给予低流量（浓度）持续氧疗

强调持续性氧疗是由于（）

A.间歇氧疗在停止吸氧时已升高的PaCO₂不会迅速降低，PaO₂更加降低，缺氧恶化

B.为了避免CO₂潴留加重.

C.为了避免PaO₂波动幅度过大

D.为了保证组织氧提取的持续性

E.以上都不是

茵陈对心血管系统的作用是（）

A、降血压

B、抗动脉粥样硬化

C、增加冠脉血流量

D、强心

E、降低心肌耗氧量