路基横断面图主要用以()和作为路基施工的依据。
A.表达路线中心纵向线型
B.沿线地面欺负状况、地质
C.计算土石方的数量
D.沿线设置构造物的好概况
参考答案:C
Following recent reports about a ripener used in several provinces, experts said the chemical
_____ ripens fruits and vegetables does no harm to human health.[ ]
A. who
B. that
C. why
D. how
撰写规范性文体时,所运用的表达方式主要是议论和说明。( )