房屋的建筑总平面图中应注出()。
A、室外地面相对标高
B、室内地面相对标高
C、房屋绝对高度
D、房屋建筑层数
参考答案:D
There _______ some trees around the house. Now, there's nothing. [ ]
A. used to have
B. used to be
C. are used to have
D. use to be
以下学习文具,通常情况下属于导体的是 [ ]
A.铅笔芯
B.塑料三角尺
C.透明塑料笔袋
D.橡皮