设<img src="http://jgxm-question.oss-cn-beijing.aliyuncs.com/psst/files/941491ef29e54c0fabe9ec0dd56e204b.png?x-oss-process=image/sharpen,200"/>在<img src="http://jgxm-question.oss-cn-beijing.aliyuncs.com/psst/files/6e7219b83ed9475da4d8f94f7b039d05.png?x-
PURPOSE:The device which is interchangeable with the device having an adjusting inlet of a flow with a optimal opening area with respect to a depth of the depth of the water, said device preventing a decrease of the gas feeding due to the excess or the shortage of the exhaust volume ...
在自然状态下,豌豆都是纯种,但纯合的高茎和矮茎豌豆群体(基因型分别为DD和dd)中偶尔也会出现杂合的植株,使用秋水仙素处理该杂合植株得到四倍体植株甲。下列说法错误的是( )A.自然状态下豌豆为纯种的原因是豌豆是闭花受粉的植物B.纯合的豌豆群体中偶尔出现的杂合植株
Production method of curved surface displayAs for this invention, membrane (1,11; 2,12) with gluing between the membrane (1,11; 2,12) in order to be kept in curved surface form, at least the 1st membrane (1,11) the 2nd membrane (2,12) the step which glues to the surface is ...