已知列表lst=[1,2,3,4,5,6,7,8,9],则表达式sum(lst[1::3])的值为()
第1题
已知输出逻辑函数表达式为 F1(A,B,c)=∑m(2,5,6,7) F2(A,B,c)=∑m(1,2,3,4,5,6) 试画出:(1)由一般标准门电路构成的组合逻辑电路; (2)等效的FPLA器件的基本熔丝结构; (3)FPLA器件的映象逻辑图。
第2题
已知离散型随机变量X的概率分布列表如表5-15:
表5-15 | |||
X | -3 | 1 | 2 |
P | frac{2}{3} | frac{1}{6} | frac{1}{6} |
则数学期望E(X)=______.
第3题
已知载波输出信号为uc(t)=Umcos(ωct),调制信号uΩ(t)=UΩmcos(Ωt),调制灵敏度为k,试列表写出普通调幅波、调频波和调相波的振幅、瞬时角频率、瞬时相位和输出电压表示式,并画出它们相应的波形。
第4题
The relation between the two paragraphs is that in the 2nd paragraph the author
[A] challenges the viewpoint in the lst paragraph.
[B] modifies his view expressed in the lst paragraph.
[C] provides the reason for the argument in the lst paragraph.
[D] further analyzes the issue discussed in the lst paragraph.
第5题
The word "regression" in the lst paragraph is best replaced by
[ A] backward movement.
[ B] uncontrolled inclination.
[ C] rapid advancement.
[ D] unexpected restoration.
第6题
已知在管式反应器中进行液相反应:
A→R+S
其为吸热反应,反应管外油浴温度(Tc)恒定为613K,假定已知其管内温度(T)与反应物的转化率(xA)的关系为
K
式中,速率常数,其中,A=1.17×1017min-1,Ea=1.84×105J·mol-1,气体常数R=8.314J·mol-1·K-1,T为管内反应温度。
若反应器入口温度为613K,反应器出口转化率为90%,试列表计算转化率每变化0.1,管式反应器内相应的温度。
第7题
What does "round the clock" mean (lst sentence in paragraph 3)?
A.The diners serve customers half a day.
B.The diners serve customers at certain hours.
C.The diners serve customers 24 hours a day.
D.The diners serve customers only on weekdays.
第8题
A.溴甲酚紫葡萄糖肉汤
B.LST肉汤
C.煌绿乳糖胆盐肉汤(BGLB)
D.月桂基硫酸盐胰蛋白胨
第9题
若有定义:“int a[6]={1,2,3,4,5,6),*p一&a[2];”则p[1]的值是()。
A.2
B.3
C.4
D.5
第10题
若有如下程序: main() { int s[]={1,2,3,4,5,6,},*p=s; printf{"%d,%d\n",*(p+3),*(p+5)}} 则程序运行后的输出结果是【 】。