— Where's your grandfather?
— He's _____________ home. [ ]
A. at
B. in
C. on
答案:A
来自CO变换炉下部的工艺气流首先被冷凝液淬冷,然后通过胺再沸器()管程。
A、D-10
B、E-6
C、T-2
D、T-1
清代揭帖的类型和运作情况如何?