实验是研究化学的基础,下图中所示的实验方法、装置或操作完全正确的是
A.干燥Cl2
B.吸收HCl
C.制取Fe(OH)2沉淀
D.稀释浓H2SO4
答案:C
I don’t know how they ____the first couple of weeks after the strong earthquake.
A.got around
B.got through
C.got over
D.got up
下面哪个信道用来发送测量报告?()
A、SDCCH
B、SACCH
C、PCH
D、FACCH