下列属于大型充填式溶洞处理方法的是()。
A.浆砌封闭、回填压实
B.隧底回填、拱顶防护
C.长管棚
D.简支跨越
参考答案:B
—There is still a copy of the book in the library.Will you go and borrow______?
—No,I’d rather buy___in the bookstore.
A.it;one
B.one;one
C.one;it
D.it;it
对厂商征税,将使产品的供给曲线左移,使均衡价格下降,均衡产量上升。( )