不见于碱性尿的结晶是
A.磷酸盐结晶
B.尿酸结晶
C.无定性磷酸铵盐
D.磷酸铵镁结晶
E.碳酸钾结晶
参考答案:B
解析:尿酸结晶为酸性结晶。
下列哪些情况有发生爆炸的危险,应预防?
A、爆炸极限内
B、爆炸上限以上
C、爆炸下限以下
D、A和B
Returning to England from Germany in 1799, William Wordsworth and his sister settled at Dove Cottage in Grasmere, Westmoreland. The poet ______ as well as ______ lived nearby, and the three men became known as the "Lake Poets."
A. Samuel Taylor Coleridge; George Gordon ByronB. Robert Southey; Samuel Taylor ColeridgeC. John Keats; Robert SoutheyD. George Gordon Byron; Percy Bysshe Shelley