Isoamyl butyrate was synthesized by using ceric sulfate as the catalyst.以硫酸高铈为催化剂,正丁酸和异戊醇为原料合成了正丁酸异戊酯.Isoamyl butyrate was synthesized by using gallium sulfate supported on silica gel as the catalyst.以自制的硅胶固载硫酸镓为催化剂,正丁酸和...
木头可以用来消音.Wood is used to deaden the noise.消音功能会消除你这一方的所有音频传送, 不仅仅是麦克风.Mute silence all audio transmission from your end, not just the microphone.他用橡胶垫给机器消音.He deadened the noise of the machine with rubber mats....
这片潮湿地区也吸引了青蛙、蟾蜍和蝾螈一类的生物。This wet area also attracts frogs, toads and newts.蝾螈的肢体可以再生。Newts can regenerate their limbs.黑色皮肤上通常有黄色斑点的欧洲蝾螈.European salamander having dark skin with usually yellow spots....
正交轨线的问题一直处于沉寂状态.The subject of orthogonal trajectories remained dormant.20天的轨线有时辰有用, 可是从15年前开始就走下坡路了.Twenty - day trajectories worked for a whellole, but that started going downhelloll 15 years ago.最后给出了与子午线交定角的轨线方程的解法.F...
This age-old struggle for control had led to untold bloody wars.这场由来已久的对控制权的争夺已经引发了无数流血的战争。Like most "peacetime wars" it did not conform to preconceived ideas.如同大多数“和平时代的战争”一样，这与我们的预想不同。Ben has also been in the wars. He ...