对脱硫用吸收剂有两个衡量的主要指标，就是纯度和（）。
A、硬度；
B、密度；
C、溶解度；
D、粒度
参考答案：D
Which one of the following best characterizes the alternative hypothesis The alternative hypothesis is usually the:（）
A. hypothesis that is proved through statistical testing.
B. hoped -for outcome.
C. hypothesis to be proved through statistical testing.
全新君越2.4L SIDI豪华舒适型驾驶员座椅带有几组记忆功能（）。
A.1
B.2
C.3
D.4
