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一般都认为烟草就是两个野生种Nicotiana sylvestris(2n=24=12II=2X=SS)与N、tomentosiformis(2n=24=12II=2X=TT)合并起来得异源四倍体(2n=48=24II=SSTT)。某烟草单体(2n-1=47)与N、 sylvestris杂交得F1群体内,一些植株有36个染色体,另一些植株有35个染色体。细胞学得检查表明,35个染色体得F1植株在减数分裂...
故可从计算系数行列式入手. [解] 方程组的系数行列式a ba A = bb =[a+(n-1)b](a-b)x1, : b b b a (1)当a≠b且a≠(1-n)b时,方程组只有零解. (2)当a=b时,对系数矩阵作初等行变换,有a a 1 1 1 1 a 0 0 0 0 A = a a a 0 0 : : ■ 0 0 0 由于n-r(A)=n-1,取...
(1) This passage most probably is a(n) . [ ] A. advertisement B. news story C. lab report D. letter of thanks (2) From the passage we learn that Mindle is a device which . [ ] A. has neither wires nor weight B. is operated by a co
1.Is there 2.Whereis 3.There isn’t 4.Nothere isn’t 5.post office 【解析】 1.原句是there be结构,变为一般疑问句,只需把be动词提至句首并大写首字母即可。根据句意结构,可知填(1). Is (2). there。 2.原句对behind the park划线,是问地点,需用where... ...
要求输入n,输出从2000.1.1开始往后n天的那一天的年月日星期.Given the number of days that have elapsed since January 1,2000 A.D,your mission is to find the date and the day of the week.InputThe input consists of lines each containing a positive integer,which is the number of days that ...
回答是yes it is 还是yes he is?为什么? 问题中是this,虽然指人的时候he和she 很常用,但是也可以用this和that。就是this/that person. This和that的问句对应的回答是it 所以我们会回答说 yes itis 如果前面问的是Is he your brother? 对应的答案就是...
百度试题 题目/ printf("Inthe result is %sn", w) printf("nerror strlen(t1) ! strlen(t2) n")相关知识点: 试题来源: 解析反馈 收藏
Not take that horrible underground.I do hate them using the underground.It'd be cheaper,woundn't it?And well,the air is much cleaner and therefore much more relaxing.They could play.We wouldn't have to be on their backs all the time worrying.And think of you,you wouldn't have to ...