下列各类计算机存储器中,断电后其中信息会丢失的是()。
A. ROM
B. RAM
C. 硬盘
D. 软盘
查看答案
AgNO3与NaCl反应,在等量点时Ag+的浓度为()已知KSP(AgCl)=1.80×10-10()。
A. 2.00×10-5
B. 1.34×10-5
C. 2.00×10-6
D. 1.34×10-6
Continuous sounding of a fog whistle by a vessel is a signal().
A. that the vessel is anchored
B. to request the draw span of a bridge to be opened
C. of distress
D. that the vessel is broken down and drifting