采集工作场所空气中金属汞时,最常用的吸收液是()。
A.酸性氯化亚锡溶液
B.酸性高锰酸钾溶液
C.碱性高锰酸钾溶液
D.碱性氯化亚锡溶液
E.硫酸溶液
参考答案:B
He suddenly _________ ill, which made his mother very worried.
A went B stayed C fell D turned
( )是指在他人的所有物上设定的权利。
A.自物权
B.他物权
C.用益物权
D.担保物权