理想变压器原线圈接在如图所示的电压上，原副线圈匝数之比为10：1，串在原线圈上的
题型：多选题
问题：
| 理想变压器原线圈接在如图所示的电压上，原副线圈匝数之比为10：1，串在原线圈上的电流表的示数为1A，则以下叙述正确的是（ ） A．变压器输出功率为200W B．若n1=100匝，则输出端线圈的磁通量变化率的最大值为2 C．副线圈两端的电压表示数20 D．变压器的输入功率是由发电厂的输出功率决定的  |
Wb/s
V题型：多选题
Many people think that the most popular way of communicating with other people is through the mouth. But what they don’t know is that actual communication using the mouth accounts for(占……比例)only around 10%(or even less)of all the means to communicate a message.
Moreover, you can never determine the truthfulness or honesty of people by what they say alone. In fact, words expressed through the mouth often do not reflect what people really think or feel. The more reliable way you can determine their true inner feelings and thoughts is by reading their body language. Everybody communicates using these gestures and if you understand the gestures and their meanings you will be able to read people and know what they are really communicating to you. One researcher even went as far as to say that we speak to hide what’s on our minds. But gestures cannot lie.
Have you ever wondered what it would be like if you can “see through” the emotions of other people? Let’s say you ask a person whether he can do an important task. He says “OK”. But deep inside, you are questioning yourself, “Is he really willing to do this job? ” or “Does he have the confidence in finishing this task? ”You can’t question him directly because that would be like belittling him. And even if you ask him those questions, his replies will not tell you what he really feels or thinks. So the most useful way is to observe his body language. Expressions like smiling, frowning(皱眉), pouting(撅嘴), facial reddening, sweating, toe curling and sideways glances are visible hints that can help you make a right judgment.
小题1: According to the passage, we know .
A．words through the mouth are the most common way in communication
B．body language is the quickest way to help people understand each other
C．expressions are the most powerful tool to judge whether a man is confident or not
D．you may know what a person really thinks with the help of reading his body language小题2:What does the underlined sentence mean in the second paragraph?
A．We can express ourselves well by body language.
B．We use words to prevent others knowing our true thoughts.
C．Spoken words can fully reflect our true self.
D．We use body language to help express ourselves.小题3:The underlined word in the third paragraph can be replaced with .
A．looking down upon
B．speaking highly of
C．laughing at
D．believing in