()表达机械中所属各零件与部件间的装配关系和工作原理。
A、零件图
B、装配图
C、轴制图
参考答案:B
Last year he had an opportunity ______ abroad, but he gave it up.
A.study
B.to study
C.of study
D.for studying
为退休后的生活作准备的储蓄动机,通常被称为()
A.目标储蓄
B.谨慎储蓄
C.生命周期储蓄
D.遗产储蓄