difficult+to+do还是doing
| 中文名 | 棕榈酸异丙酯 |
| 中文同义 | 十六酸-1-甲基乙基酯;棕榈酸异丙酯;棕榈酸异丙酯, TECH;十六酸异丙酯;棕榈酸异丙酯,TECH.85%;十六烷酸异丙酯;棕榈酸异丙酯/十六酸异丙酯;软脂酸异丙酯 |
| 英文名 | Isopropyl palmitate |
| 英文同义 | kesscoipp;kesscoisopropylpalmitate;Lexol IPP;Liponate IPP;nikkolipp;Palmitic acid esters;Plymouth ipp;plymouthipp |
| CAS | 142-91-6 |
| 分子式 | C19H38O2 |
| 分子量 | 298.5 |
| EINECS | 205-571-1 |
| 结构式 |
|
性质 | |
| 熔点 | 11-13 °C(lit.) |
| 沸点 | 160°C 2mm |
| 密度 | 0.852 g/mL at 25 °C(lit.) |
| 折射率 | n20/D 1.438(lit.) |
| 闪点 | >230 °F |
| 储存条件 | 2-8°C |
| 溶解度 | <0.001g/l |
| 形态 | neat |
| 水溶解性 | Not miscible or difficult to mix with water. |
| BRN | 1786567 |
| InChIKey | XUGNVMKQXJXZCD-UHFFFAOYSA-N |
| NIST化学物质信息 | Isopropyl palmitate(142-91-6) |
| EPA化学物质信息 | Isopropyl palmitate (142-91-6) |
乐琦待3428be difficult to do是什么意思 -
乜爽馥19170285275 ______ be difficult to do 短语 Be very difficult to do 费事 ; 费力 ; 难做 ; 难办 Be hard put to it to do something; be difficult to do something 做..有困难 双语例句 1. This can be difficult to do in developing countries. 在发展中国家这样做可能很困难. 2. ...
乐琦待3428it's difficult to/for有什么区别? -
乜爽馥19170285275 ______ it's difficult to do sth. 做某事很难 (即后面加事) it's difficult for sb. 对某人很难(即后面加人)
乐琦待3428It is difficult to convey …….difficult to 怎么连读!谢谢! -
乜爽馥19170285275 ______ 连读是 diffcul to.“低飞口 吐” difficult中的t不读 因为t和to连起来了 .就像“want to”, 就读作wan to的. 本来正常情况下difficult中的t应该轻读,属于不完全爆破音. ———————————————————————————————— ...
乐琦待3428怎样用 find it difficult to do sth 造句 -
乜爽馥19170285275 ______ 前面加主语,(注意find的时态) 然后找个动词词组代替“to do sth＂就OK了,例如:i find it difficult to sleep
乐琦待3428it is very diffcult to 是什么句型?亲们,,谢谢... -
乜爽馥19170285275 ______ It's very difficult to do sth. 做某事很困难 其中It是形式主语,to do sth是真正的主语.如' It's very difficult to learn a foreign language. 学习一门外语很难.
乐琦待3428连词成句英文:difficult choose it's to -
乜爽馥19170285275 ______ It's difficult to choose.
乐琦待3428be difficult to do sth是什么意思 -
乜爽馥19170285275 ______ be difficult to do sth是“做某事有困难”的意思.
乐琦待3428I find it difficult to do sth 是什么句型 -
乜爽馥19170285275 ______ find it adj to do sththink it adj to do sth 这里是it 做形式宾语,其实真正的宾语是不定式
乐琦待3428be difficult to do是什么意思 -
乜爽馥19170285275 ______ be difficult to do 短语Be very difficult to do 费事 ; 费力 ; 难做 ; 难办Be hard put to it to do something; be difficult to do something 做..有困难双语例句 1.This can be difficult to do in developing countries. 在发展中国家这样做可能很困难.2....
乐琦待3428be difficult后跟to还是for
乜爽馥19170285275 ______ It is very difficult for a smoker to do without tobacco. 对吸烟的人来说,戒烟是很困难的 It is difficult for me to stop smoking. 戒烟对我来说是困难的. 从这2个例子可以看出,be difficult+for+sb. +to do sth. 所以,应该跟for.