管道的等量长度中的摩擦损失即构成弯管中的压力损失.Friction losses in the equivalent lengths of ducts constitute the pressure loss in the elbow.对小半径弯管国产化的可行性,作了技术论证.The feasibilities of small - radius pipe - bender made in china are demonstrated ...
Calcium is excreted in the urine and stools.钙通过尿液和粪便排出体外。If you don't make your choice in time, you are likely to fall between two stools.如果你不及时作出决定, 就会两头落空.Joanna was pouring the drink. While she was thus engaged, ...
有许多种氨基酸人体自身不能合成.There are many amino acids that the body cannot synthesise itself.有许多种氨基酸人体自身不能合成。There are many amino acids that the body cannot synthesize itself.丙氨酸在转氨作用中似乎是更好的氨基酸.Alanine appears to be the preferred a...