在汽液两相区的湿蒸汽有M=Msvx+Msl(1-x)(M=V、U、H、S等),试证明压缩因子Z同样满足此式。 (2)证明
2.1mol H2SO4含多少个H2SO4分子、多少个H原子、多少个S原子、多少个O原子?
如下表
计算过程 | ||||||||
断面 | h/m | A/m2 | v/(m/s) | bar{v}/(m/s) | frac{alpha v^{2}}{2g}/m | χ/m | R/m | bar{R}/m |
6 | 4 | 72 | 0.658 | 0.022 | 26.422 | 2.725 | ||
0.682 | 2.671 | |||||||
5 | 3.8 | 67.26 | 0.705 | 0.025 | 25.701 | 2.617 | ||
0.73 | 2.563 | |||||||
4 | 3.6 | 62.64 | 0.755 | 0.029 | 24.98 | 2.508 | ||
0.785 | 2.453 | |||||||
3 | 3.4 | 58.14 | 0.815 | 0.034 | 24.25 | 2.398 | ||
0.835 | 2.364 | |||||||
2 | 3.28 | 55.50 | 0.854 | 0.037 | 23.83 | 2.329 | ||
0.858 | 2.324 | |||||||
1 | 3.26 | 55.06 | 0.861 | 0.038 | 23.75 | 2.318 |
断面 | C/(m1/2/s) | bar{C}/(m^{1/2}/s) | bar{J}=frac{bar{v^{2}}}{bar{C^{2}}bar{R}} | Delta l=frac{Delta e}{(i-bar{J})}/m | l=∑Δl/m |
6 | 47.29 | ||||
47.13 | 7.84×10-5 | 1620.07 | 1620.07 | ||
5 | 46.97 | ||||
46.8 | 9.49×10-5 | 1864.89 | 3484.96 | ||
4 | 46.64 | ||||
46.47 | 11.63×10-5 | 2329.75 | 5814.71 | ||
3 | 46.29 | ||||
46.18 | 13.83×10-5 | 1896.27 | 7710.98 | ||
2 | 46.07 | ||||
46.05 | 14.9×10-5 | 333.33 | 8044.31 | ||
1 | 46.03 | 相对误差:left| frac{804431-8000}{8000} right|=5% |
根据298.15K,pΘ时物质的值,(1)求下列反应CO2(g)+2NH3(g)=CO(NH2)2(s)+H2O(l)的;(2)计算上述反应在298.15K及pΘ下的ΔrGΘm值,.并判断由CO2(g)和NH3(g)反应生成尿素是否为自发过程.
设f,g,h,s,t为第4题中的五个函数.
(1) 试问:除第4题6个小题中的两个函数的复合外,还有哪些两个函数可以进行复合,并求这些复合函数的导数;
(2) 求下列复合函数的导数:
在水平不透水地基上筑以梯形断面的均质堤防如图所示,堤防土壤的渗透系数k=2×10-4cm/s,坝高Hn=15m,坝顶宽b=18m,上游水深H=12.4m,下游边坡系数m2=1.5,试求: (1)单宽流量; (2)绘制浸润线。
(1)对上式取拉氏变换,求回波系统的系统函数H(s);
(2)令设计一个逆系统,先求它的系统函数Hi(s);
(3)再取H1(s)的逆变换得到此逆系统的冲激响应hi(t),它应当与教材第二章2.9节的结果一致.
A.I prefer
B.that’s OK
C.I’d love to
D.What do you like
E.Would you like to go
F.That sounds fine
G.cannot Work
H.have to work late
第 56 题 Dave:I have tickets to The Phantom of the Opera on Friday night. 1 ?
Susan:Thanks. 2 .What time is the show?
Dave:h’s at 8:00.
Susan:That sounds great.So,do you want to have dinner at 6:00
Dave:Uh,I'd like to,but I 3 .
Susan:Oh, 4 .Let’S just meet at the theater before the show,around 7:30.
Dave: 5 .
(1)B艇相对A艇的速度;
(2)A艇相对B艇的速度。