题目内容

什么是蓝细菌?其细胞特点如何?其与水质的关系如何?

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It has been decided that a collision due to any cause other than the negligence of the Shipowner or his servants is within the scope of().

A. act of God
B. peril of the sea
C. queen's enemies
D. inherent vice in the good

消除残余应力有哪些方法?

突水和突泥的区别在于有无()

A. 断层或岩溶洞穴
B. 松散碎屑物质
C. 封闭的边界
D. 高势能的地下水

社会主义国家的特征主要有哪些?

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