已知A(1)=1,A(2)=2,A(3)=6,A(4)=8则A(A(1)+A(2))=()。
On the approach of a warm front the barometric pressure usually().
After a cold front passes,the barometric pressure().
A decrease in barometric pressure is associated with all of the following except().
After a cold front passes the barometric pressure usually().
A slow rise in the barometric pressure forecasts().
When observing a rapid rise in barometric pressure,you may expect().
A single barometric pressure reading of 28.60 indicates().
In shallow water,waves that are too steep to be stable,causing the crests to move forward faster than the rest of the wave,are called().
对任何一个量A,都可以写成A={A}·[A],其中[A]代表量A的单位,{A}代表A在使用单位[A]时的数值。()
一个2行3列的二维数组a,可以视为包含a[0]、a[1]两个元素的一维数组,而a[0]、a[1]又是各包含三个元素的一维数组,其中a[0]的三个元素为a[0][0]、a[0][1]、a[0][2],a[1]的三个元素为a[1][0]、a[1][1]、a[1][2],此时可将a[0]、a[1]视为数组名。
智慧职教: (A ∩ B) ∪ A = A (A ∪ B) ∩ A = A
设 < A,* > 是一个半群,而且对于A中的元索a和b,如果a≠b必有a*b≠b*a,试证明: a)对于A中的每个元索a,有a*a=a。 b)对于A中任何元索a和b,有a*b*a=a. c)对于A中任何元素a,b和c,有a*b*c=a*c.
关于构造函数A()的拷贝构造函数正确的是A.A(A*B);B.A(AB);C.A(A&B);D.A(A);
A= A ; 1mA= μA; 1μA= m A= A
关于构造函数A()的拷贝构造函数正确的是A.A(A *B) ;B.A(AB) ;C.A(A&B);D.A(A);
设(A,* )是一个半群,而且对于A中的元素a和b,如果a≠b必有a*b≠b*a,试证明:(1)对于A中每个元素a,有a*a=a;(2)对于A中任何元素a和b,有a*b*a=a;(3)对于A中任何元素a,b和c,有a*b*c=a*c。
Luigi likes to get as much exercise as possible and particularly likes climbing steep hills to get a good view. He wants to do a walk that is difficult and offers a range of scenery.'
在粗糙脉孢菌两个连锁基因的分析中,AB × ab杂交产生的7种子囊型如下表,请完善表格信息并进行两个基因的连锁作图(画出连锁图)。 子囊型 ① ② ③ ④ ⑤ ⑥ ⑦ 四分子基因型 排列 A A a a B B b b A A a a b b B B A A a a b B b B A a A a B B b b A a A a B b B b A a A a b B b B A a A a b B B b 子囊数 686 4 150 145 6 4 5 分离时期 四分子类别
下边循环执行完后,a为()。 for (a= 1;a< 5; a++ ) a = 2 * a;
§ [C] As demand for food rises faster than supplies are growing, the resulting food-price inflation puts severe stress on the governments of many countries. Unable to buy grain or grow their own, hungry people take to the streets. Indeed, even before the steep climb in grain prices in 2008, the number of failing states was expanding. If the food situation continues to worsen, entire nations will break down at an ever increasing rate. In the 20th century the main threat to international security was superpower conflict; today it is failing states.
设A={a,b,{a,b},c},B={b,{b,c},{a}},求A-B,B-A,A B.设A={a,b,{a,b},c},B={b,{b,c},{a}},求A-B,B-A,A B.
运用布尔代数计算下面表达式的值不是为a的是:() A: a(a+b) B: a+a.b C: a+a D: a+b