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【简答题】
There are several ways you can find out about the countries and places you wish to visit. You can talk to friends who have travelled to the places. Or you can go and see a colour film. Or you can read travel books. It would seem that there are three kinds of travel books. The first are those that give a personal, subjective (主观的) account of travels which the author has actually made himself, if they are informative and have a good index (索引), then they can be useful to you when you are planning your travels. The second kind are those books whose purpose is to give a purely objective (客观的)description of things to be done and seen. If a well-read, cultured person has written such a book, then it is even more useful. It can be sorted as a selected guide book. The third kind are those books which are called "a guide" to some place or other. If they are good, they will, in addition to their factual information, give an analysis or an explanation. Like the first kind they can be inspiring and interesting. But their basic purpose is to help the reader who wishes to plan in the most practical way. Whatever kind of travel book you choose you must make sure that it does not describe everything as "wonderful", "excellent" or "magical". You must also note its date of publication because travel is a very practical affair and many things change quickly in the twenty-first century. Finally, you should make sure that the contents are well presented and easy to find.The following travel books may be of use when you plan your travels except (). A. the book written by some people who have had the same travel experience themselves B. the book which tells you what is worth doing and seeing based on the facts C. the book in which a lot of big adjectives are used to draw your attention D. the book which offers you a lot of useful information like a tour guide
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【单选题】以下关于信息的说法正确的是( )
A.
不确定性越小的事件信息量越大
B.
不确定性越大的事件信息量越大
C.
信号越大的事件信息量越大
D.
信号越小的事件信息量越大
【单选题】以下关于信息的说法不正确的是()。
A.
信息可以共享
B.
信息可以被传递
C.
信息可以保存
D.
信息不能被处理
【单选题】下列关于信息的说法正确的是( )
A.
信息的时效性决定信息一旦过时就毫无价值
B.
信息看不见、摸不着,可以不依附于载体
C.
信息是可以加工和处理的
D.
信息的价值是由信息的载体形式来决定的
【简答题】多倍体育种时常用的诱变剂是 ,它的作用原理是 ;多倍体的鉴定方法主要有 、 、 和 等。
【单选题】以下关于信息的说法正确的是()
A.
不确定性越小的事件信息量越大
B.
不确定性越大的事件信息量越大
C.
信号越大信息量越大
D.
信号越小的事件信息量越大
【单选题】下面关于信息的说法正确的是( )
A.
信息无法度量
B.
信息熵最小时不确定性最高
C.
不确定性最高时信息价值最大
D.
信息可以视为“不确定性”和“自由选择度”的度量
【简答题】已知玉米的黄粒(D)对紫粒(d)为显性,抗病(R)对不抗病(r)为显性,控制上述两对性状的基因分别位于两对同源染色体上。现选择纯种紫粒抗病与黄粒不抗病为亲本杂交得到F 1 ,F 1 自交得到F 2 ,从而获取黄粒抗病植株进行深入研究。请根据材料分析回答: (1)上述育种过程所依据的原理是________。 (2)正常情况下,在F 2 代中,重组类型所占的比率为________;在F 2 代的黄粒抗...
【简答题】多倍体育种时常用的诱变剂是 ,它的作用原理是 ;多倍体的鉴定方法有 、 、 等。
【判断题】线粒体基因组控制的性状在杂交后代中不分离。
A.
正确
B.
错误
【简答题】如图所示电路中,已知R1=R2=R3=2【图片】,E1=10V,E2=8V,求各支路电流 I1= A,I2= A,I3= A。【图片】
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