多项选择题 改地适树，就是通过（）等管理措施改变造林地的生长环境，使之适合于原来不适应的树种生长。

单项选择题 We are ______ your letter 26 June and have acted on your instruction. A．in receipt of/duly B．acknowledgement of/immediately C．in priority of/quickly D．in arrangement of/considerably

多项选择题 厚层基材喷射植被护坡技术要求是（）