开槽时局部超深大于0.15m（沟底无水），应该用（）回填夯实解决。
A.天然砂
B.原土
C.石灰
D.预制板
参考答案：A, B, C
—_______ some apples and pears?
—Yes, please. [ ]
A. What would you like
B. Would you like to
C. Would you like
D. What you like
ECD填充柱气相色谱测定生活饮用水中的四氯化碳的原理是什么？
