某土样粒度分析结果如下表所示,按《岩土工程勘察规范》(GB50021-2001)(2009版),其土名应定为()。
A.圆砾
B.砾砂
C.粗砂
D.粉土
参考答案:B
I’m surprised to hear from my school teacher again. ________, it is ten years since we met last.
A.In a word
B.Believe it or not
C.That’s to say
D.Of course
已知:梯形上底长为8cm,下底长为12cm,则梯形的中位线长为______cm.