下图（a）所示为一个模块层次结构的例子，图（b）所示为对其进行集成测试的顺序，则此测试采用了（ ）测试策略。该测试策略的优点不包括（ ）。
问题1选项
A.自底向上
B.自顶向下
C.三明治
D.一次性
问题2选项
A.较早地验证了主要的控制和判断点
B.较早地验证了底层模块
C.测试的并行程度较高
D.较少的驱动模块和桩模块的编写工作量
正确答案及解析
正确答案
解析
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