黑斑病甘薯中毒牛的主要病变是()。
A.胃肠炎
B.肺炎
C.间质性肺气肿
参考答案:C
_________ the internet is _________, I do not think it is a good idea to spend too much time on it.
A.When ; helpful
B.As ; great help
C.While ; of great help
D.Now ; of no help
强夯置换时,夯孔施打顺序宜()隔空分序跳打方式,逐一完成全部夯点施工。
A、由外向内
B、由内向外
C、没有要求