地面找平层是起整平找坡或加强作用的构造层，它承受并传递地面荷载于基土之上。
参考答案：对
.
The teaching building is _________ by many trees, some ______ over 30 metres.
A．surrounded, measuring
B．surrounded, measured
C．surrounding, measured
D．surrounded, measure
吾甚非之。 非：（）
