bpenepy的简单介绍

本文目录一览：

• 1、喷头PY-5035和水泵机组65BP-55什么意思
• 2、聚苯乙烯的单体是什么
• 3、c++问题，不能导出名字为title的txt文件，求大神帮忙解决。。。
• 4、平面上有两点A(-1,0),B(1,0),点P在圆周（x-3)^2+(y-4)^2=4上，求使AP^2+BP^2最小值时点P的坐标

喷头PY-5035和水泵机组65BP-55什么意思

你了解喷头PY-5035和水泵机组65BP-55什么意思，不知道你说的喷头是不是喷淋管道的喷头，用于消防的喷头设计标注一般为喷头温级68度，喷头流量为系数K=80。不知道你喷头用于什么方面，PY是喷头的型号，5035是喷头的流量或者是其他方面的标示。水泵机组65BP是水泵机组立式65口径，55是水泵的吸水扬程高度。

聚苯乙烯的单体是什么

这是REACH注册过程中必需要出具的物质CAS编号.下面是聚苯乙烯的CAS号和他的一些基本信息.有关REACH方面的问题可以问我13771066122.

CAS: 9003-53-6

分子式: C8H8(unspec.)

沸点: 212℃

中文名称: 聚苯乙烯树脂

乙烯基苯均聚物

苯乙烯乳胶

泡沫聚苯乙烯

聚苯乙烯橡胶微球

聚苯乙烯

英文名称: Polystyrene resin

Benzene, ethenyl-, homopolymer

PS resin

168n15

3a

454h

475u

666u

686e

825tv

825tv-ps

a 3-80

afcolene

afcolene 666

afcolene s 100

atactic polystyrene

bactolatex

bakelite smd 3500

basf iii

bdh 29-790

ethenyl-benzen homopolymer

bextrene xl 750

bicolastic a 75

bicolene h

bio-beads s-s 2

bp-klp

bsb-s 40

bsb-s-e

bustren

bustren k 500

bustren k 525-19

bustren u 825

bustren u 825e11

bustren y 3532

bustren y 825

cadco 0115

carinex gp

carinex hr

carinex hrm

carinex sb 59

carinex sb 61

carinex sl 273

carinex tgx/mf

copal z

cosden 550

cosden 945e

denka qp3

diarex 43g

diarex hf 55

diarex hf 55-247

diarex hs 77

diarex ht 190

diarex ht 500

diarex ht 88

diarex ht 88a

diarex ht 90

diarex yh 476

dorvon

dorvon fr 100

dow 1683

dow 360

dow 456

dow 665

dow 860

dow mx 5514

dow mx 5516

dylark 250

dylene

dylene 8

dylene 8g

dylene 9

dylite f 40

dylite f 40l

edistir rb

esbrite

esbrite 2

esbrite 4

esbrite 4-62

esbrite 500hm

esbrite 8

esbrite g 10

esbrite g-p 2

esbrite lbl

escorez 7404

estyrene 4-62

estyrene 500sh

estyrene g 15

estyrene g 20

estyrene g-p 4

estyrene h 61

ethenylbenzene homopolymer

fc-my 5450

fg 834

foster grant 834

gedex

hf 10

hf 55

hf 77

hh 102

hhi 11

hi-styrol

hostyren n

hostyren n 4000

hostyren n 4000v

hostyren n 7001

hostyren s

ht 88

ht 88a

ht 91-1

ht-f 76

it 40

k 525

kb (polymer)

km (polymer)

koplen 2

kr 2537

krasten 052

krasten 1.4

krasten sb

lacqren 506

lacqren 550

latex

ls 061a

ls 1028e

lustrex

lustrex h 77

lustrex hh 101

lustrex hp 77

lustrex ht 88

mx 4500

mx 5514

mx 5516

mx 5517-02

n 4000v

napst

nbs 706

oligostyrene

owispol gf

pelaspan 333

pelaspan esp 109s

piccolastic

piccolastic a

piccolastic a 25

piccolastic a 5

piccolastic a 50

piccolastic a 75

piccolastic c 125

piccolastic d

piccolastic d 125

piccolastic d 150

piccolastic d-100

piccolastic e 100

piccolastic e 200

piccolastic e 75

poligostyrene

polyco 220ns

polyflex

polystrol d

polystyrene

polystyrene bw

polystyrene latex

polystyrene nanoparticles

polystyrene polymer latex

polystyrol

printel’s

prx 1195

ps 1 (polymer)

ps 2

ps 2 (polymer)

ps 200

ps 209

ps 454h

ps 5 (polymer)

ps-b

psb-c

psb-s

psb-s 40

psb-s-e

psv-l

psv-l 1

psv-l 1s

psv-l 2

py2763

r 3

r 3612

rexolite 1422

rhodolne

s 173

sb 475k

sd 188

shell 300

smd 3500

sps 600

srm 705

srm 706

st 30ul

st 90

sternite 30

sternite st 30vl

stryon 686

styrafoil

styragel

styrene polymers

styrex c

styrocell pm

styrofan 2d

styroflex

styrofoam

styrolux

styron 440a

styron 470a

styron 475

styron 475d

styron 492

styron 666

styron 666k27

styron 666u

styron 666v

styron 678

styron 679

styron 683

styron 685

styron 690

styron 69021

styron gp

styron ps 3

styron t 679

styropian

styropian fh 105

styropol ht 500

styropol ibe

styropol jq 300

styropol ka

tc 3-30

tgd 5161

tmde 6500

toporex 500

toporex 550-02

toporex 830

toporex 850-51

toporex 855-51

trolitul

trycite 1000

u625

ubatol u 2001

ucc 6863

up 1

up 2

up 27

upm

upm508l

upm703

vestolen p 5232g

vestyron

vestyron 114-12

vestyron 512

vestyron mb

vestyron n

vinamul n 710

vinamul n 7700

vinyl products r 3612

vinylbenzene polymer

x 600

poly(styrene)

polymeric beads,expandable

Benzene,ethenyl-,homopolymer

MALDI validation set polystyrene Mp 500-70’000certified according to DIN

Polystrene Standard 88’000

Polystrene Standard broad 206’000

Polystrene Standard broad 350’000

Polystyrene solution

Polystyrene latex microsphere,1micron

Polystyrene latex microsphere,2micron

Polystyrene latex microsphere,0.05micron

Polystyrene latex microsphere,0.10micron

Polystyrene latex microsphere,0.20micron

Polystyrene latex microsphere,0.50micron

Polystyrene latex microsphere,4.5micron

Polystyrene latex microsphere,6.0micron

Polystyrene latex microsphere,10.0micron

Polystyrene latex microsphere,15.0micron

Polystyrene latex microsphere,20.0micron

Polystyrene latex microsphere,25.0micron

Polystyrene latex microsphere,0.75micron

Polystyrene latex microsphere,45.0micron

Polystyrene latex microsphere,75.0micron

Polystyrene latex microsphere,90.0micron

Polystyrene latex microsphere,1micron,dry form

Polystyrene latex microsphere,fluorescent,6.0micron

Polystyrene,atactic

Polystyrene,M.W.ca 100,000

c++问题，不能导出名字为title的txt文件，求大神帮忙解决。。。

我在linux系统下编译可以生成

Analyses of Biguanides and Related Compounds in Biological and Environmental Samples by HPLC.txt

可能是这个名字太长了，windows下不支持这么长的名字？

你试试换个固定文件名看能不能输出

平面上有两点A(-1,0),B(1,0),点P在圆周（x-3)^2+(y-4)^2=4上，求使AP^2+BP^2最小值时点P的坐标

设P点坐标(x,y)，P在圆周上，所以P满足(x-3)²+(y-4)²=4

PA²=(x+1)²+y² PB²=(x-1)²+y²

PA²+PB²=2x²+2y²+2

把圆的方程展开x²-6x+9+y²-8y+16=4→ x²+y²+1=6x+8y-20

PA²+PB²=4(3x+4y-10)

∵3x+4y≥2√12xy=4√3xy且当3x=4y时

∴代入圆的方程得P(21/5,28/5)