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【简答题】
Everybody knows that words can carry messages. People communicate with words. Books, magazines, TV, radio and films all help us to communicate with others. They all help us to know what is going on in the world and what other people are thinking about. Do you think you can communicate without words? A smile on your face shows you are happy or friendly. Tears in your eyes tell others that you are sad. When you put up your hand in class, the teacher knows you want to say something or ask a question. You shake your head, and people know you are saying “No”. You nod and people know you are saying “Yes”. Other things can also carry messages. For example, a sign at the bus stop helps you to know which bus to take. A sign on the wall of your school helps you to find the library. Signs with arrows on doors tell you where to go in or out. Have you ever noticed that there are a lot of signs around you and that you receive messages from them all the time? People can communicate in many ways without words. For example, an artist can use his drawings to tell about beautiful mountains, about the sea and many other things. 小题1: Which of the following statements is NOT true? A.It is a most popular way for man to communicate with words. B.Words are the only way for man to communicate. C.Using radio is one of the ways for man to communicate. D.TV can help people to know the world better. 小题2: Besides words, which can also be used to express oneself? A.Sign language. B.Smile. C.Head shaking. D.Nodding. 小题3: Which of the following signs is usually used to show you the direction? A.Picture. B.A number. C.A kind of color. D.An arrow. 小题4: According to the passage, how does an artist often express himself? A.He writes articles. B.He gives reports. C.He sings songs. D.He draws pictures.
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【单选题】晶形沉淀的沉淀条件
A.
沉淀反应时要求:稀、搅、热、陈化
B.
沉淀反应时要求:浓、热、加电解质、不陈化
C.
沉淀溶解度小、纯净、易过滤和洗涤
D.
组成应固定、化学稳定性好、分子量大
E.
沉淀需过滤、加有机溶剂、利用高浓度Fe3+作指示剂
【判断题】比特率是指单位时间内传送比特(bit)的个数,用于衡量网络的数据传输速率,单位是比特bps。
A.
正确
B.
错误
【判断题】一般粉状石灰的有效储存期为三个月,否则胶凝性会明显降低,过期石灰应重新检验其有效成分含量
A.
正确
B.
错误
【单选题】晶形沉淀的沉淀条件是
A.
沉淀反应时要求:稀、搅、热、陈化
B.
沉淀反应时要求:浓、热、加电解质、不陈化
C.
沉淀溶解度小、纯净、易过滤和洗涤
D.
组成应固定、化学稳定性好、分子量大
E.
沉淀需过滤、加有机溶剂、利用高浓度 Fe 作指示剂
【简答题】沉淀反应时要求:
【简答题】误码率通常指的是_____差错概率, 而误比特率是指 ________差错概率。
【单选题】沉淀反应中对称量形式的要求是
A.
沉淀反应时要求:稀、搅、热、陈化
B.
沉淀反应时要求:浓、热、加电解质、不陈化
C.
沉淀溶解度小、纯净、易过滤和洗涤
D.
组成应固定、化学稳定性好、分子量大
E.
沉淀需过滤、加有机溶剂、利用高浓度Fe3+作指示剂
【简答题】作沉淀反应时,一般应稀释______,而作凝集反应时,则一般必须稀释______。
【单选题】沉淀反应中对沉淀形式的要求()
A.
沉淀反应时要求:稀、搅、热、陈化
B.
沉淀反应时要求:浓、热、加电解质、不陈化
C.
沉淀溶解度小、纯净、易过滤和洗涤
D.
组成应固定、化学稳定性好、分子量大
【单选题】沉淀反应中对沉淀形式的要求
A.
沉淀反应时要求:稀、搅、热、陈化
B.
沉淀反应时要求:浓、热、加电解质、不陈化
C.
沉淀溶解度小、纯净、易过滤和洗涤
D.
组成应固定、化学稳定性好、分子量大
E.
沉淀需过滤、加有机溶剂、利用高浓度Fe3+作指示剂
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