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Walking for the Heart Disease Walking is one of the most important steps for the recovery of heart disease. Time and speed are two vital aspects of walking for people with heart disease. One must walk for at least thirty five minutes per day. 小题1: The following understanding will help them to walk. Why walking? Walking is a must for a heart patient. 小题2: First, it reduces weight, controls sugar, and reduces stress. It also gives the joints (关节) enough movement, fresh air – if you walk in the morning. Regular walks help in the control of blood pressure. But the most important advantage is that it gives fitness to the heart. 小题3: Start walking slowly. Gradually increase the speed. Feel when the angina (心绞痛) is about to come. Stop, the feeling will go away. Walk again, but now the speed will be slower than the last time. Keep walking now and the angina will not come. This is the correct speed. How to start? Suppose, you are at the stage of Class I angina: start walking on Day One. Try to walk about 30 minutes. For Class II angina group, walking should be slow and they should start with 10-15 minutes. They should not walk fast. Class III angina patients should start with one minute at home on empty stomach. After two days, they should increase to two minutes. 小题4: However, do not walk more than ten minutes a time. Dos and don’ts on physical activity: Heart patients must also know that they can do most of the activities where the heart rate does not go up. Sitting in an office, talking over the phone, discussing, driving car are some of the activities which do not increase the heart’s speed. 小题5: As a matter of fact, stresses can also lead to other illnesses. A.It has a great number of advantages. B.Walking plays a very important role in helping a heart patient recover. C.How to roughly judge the proper walking speed? D.What is more important for the heart patient is to know the speed of walking. E. But avoid all kinds of stresses, as stress can increase the heart’s speed. F. How to increase the speed of walking? G. Gradually they should increase the time but not the speed.
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【单选题】正态分布曲线下(μ±1.64σ)区间的面积占总面积的
A.
95%
B.
45%
C.
90%
D.
99%
【单选题】I didn’t tell him ______ news at once because I wanted to give him surprise.
A.
a, a
B.
the, the
C.
the, a
D.
/, the
【简答题】电压负反馈使输出____保持稳定,因而____了放大电路的输出电阻;而电流负反馈使输出____保持稳定,因而____了输出电阻。串联负反馈____了放大电路的输入电阻;并联负反馈则____了输入电阻。在实际的负反馈放大电路中,有以下四种基本的反馈组态:____式、____式、____式和____式。
【简答题】放大电路交流负反馈有四种基本组态,欲稳定放大器的输出电压U0,同时增大放大器的输入电阻Ri,应当引入( )负反馈。
【单选题】已知某系统的频域系统函数为 【图片】其中K和【图片】均为正常数,则该系统是一个( )。
A.
理想带阻滤波器
B.
理想带通滤波器
C.
理想高通滤波器
D.
理想低通滤波器
【简答题】放大电路交流负反馈有四种基本组态,欲稳定放大器的输出电流I0,同时增大放大器的输入电阻Ri,应当引入( )负反馈。
【单选题】正态分布曲线下 (μ±1.64σ) 区间的面积占总面积的
A.
90%
B.
95%
C.
97.5%
D.
99%
E.
不能确定
【判断题】在实际的负反馈放大电路中,有以下四种基本的组态,分别为电压串联负反馈、电压并联负反馈 、电流串联负反馈、电流并联负反馈。
A.
正确
B.
错误
【简答题】放大电路交流负反馈有四种基本组态,欲从信号源获得更大的电流,并稳定输出电流,应在放大电路中引入( )负反馈。
【多选题】交流负反馈放大电路的基本组态是( ):
A.
电压串联负反馈
B.
电压并联负反馈
C.
电流串联负反馈
D.
电流并联负反馈
E.
交直流负反馈
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