联合国的总部设在[ ]
A.日内瓦
B.纽约
C.洛桑
D.伦敦
B
—Sorry, sir. I made a mistake again.
—_________. Practice more and you will do better.
A.Never mind
B.I'm not sure
C.You're welcome
D.Don't mention it
土的级配指标CU=D60/D10中,D60、D10表示通过率,其单位为%。()