某道路工程的边坡主要为易受雨水冲刷的土质边坡和易风化的岩石边_爱下问搜题

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问题单项选择题

某道路工程的边坡主要为易受雨水冲刷的土质边坡和易风化的岩石边坡，对这些边坡进行防护最适用的方法是( )。

A．抹面防护
B．捶面防护
C．喷射混凝土防护
D．护面墙

答案

参考答案：B

选择题

28. The farm as well as its neighboring hills we once spent so much time ____ on a new look as recently as last year.

A．on having taken

B．has taken

C．on has taken

D．having taken

问答题

简述药品的三级管理主要内容。