某慈善协会，每年都会为玉树地震灾区的孩子们提供社会救助，既有生活和学习用品，也有以奖学金形式发放的现金援助。这一事例体现了社会救助的（）特征。

A.救助水平的低层次性

B.救助手段的多样性

C.救助对象的有限性

D.救助范围的广泛性

A block and tackle is “rove to advantage”. This means that the（）.

A.blocks have been overhauled

B.hauling parts of two tackles are attached

C.hauling part leads through the movable block

D.hauling part leads through the standing block