以非质子酸氯化亚锡为催化剂,催化合成了丁醛-1,2-丙二醇缩醛.Butyraldehyde 1,2 proparediol acetal was synthesized by using stannous chloride as catalyst.以非质子酸氯化亚锡为催化剂,催化合成了丁醛-1,2-丙二醇缩醛.Butyraldehyde 1,2 propanediol acetal was synthesized by using st...
总结了目前国内外提出的多种 防 冰除冰技术及方法.Multifold techniques and methods of anti - icing and deicing are summarized.混凝土, 盐 ( 除冰剂 ) 的渗透, 和不可逆转的损失,混凝土的抗拉强度.Concrete, salt ( deicing agent ) penetration, and irreversible loss of concrete t...
Midwesterners are straightforward and unpretentious, with a reputation as resolute individualists who can be somewhat hardheaded.中西部的人直截了当而不矫饰, 他们一向被认为是坚决的个人主义者,但可能有点固执.If you weren't so hardheaded, maybe I could te...
如果支票遗失或被盗, 你会得到如数的偿还金.If the checks lost or stolen, you can receive a refund for the total amount.根据你自身的实际情况, 需偿还的税款可以分成每笔数目很小的资金, 每笔偿还金之间可以间隔几个月或者是几年.Depending on your situation, payment may be divided into smaller, sep...