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...
She can do 3000 keystrokes an hour.她在一小时内能按键3000次.Use Recorder to record keystrokes or mouse actions to play back later.用记录器记录击键或鼠标行为,以备后来播放.The number of keystrokes was used as a measure of work.敲击键盘的次数被用作工作量的度量指标....
In heavy concentrations, ozone is irritating to the eyes, nose and throat.高浓度的臭氧会对眼睛、鼻子和咽喉有刺激作用。Large concentrations of capital were in the hands of merchants.大量资本集中在商人手里.The latest data showed that global ozone concentr...
He complains that the others have done him out of his share.他抱怨其他人骗走了他应得的那份。She often complains that he is dishonest.她常埋怨说他不诚实.She always complains of the food.她常常嫌菜不好吃....
It is thus held that the eolian Nd input isnegligible to the oceanic Nd budget.因此,笔者认为风成粉尘对太平洋深水中溶解的Nd总量的影响可以忽略不计.A high - efficiency Monte Carle method for oceanic lidar system simulation has been developed.提出了一种特别适用于海洋...