下图所示实验中,用紫色石蕊试液浸泡过的紫色小花变红的是
A.①③
B.②③
C.③④
D.①④
答案:D
--Where do you suggest_________?
--Downtown in Quanzhou, of course.
A.will we locate the museum
B.the museum must be located
C.the museum be located
D.should we locate the museum
国家规定有()种基本防爆类型。
A、七
B、八
C、九
D、十