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
