关于无人值班变电站直流系统中蓄电池组容量选择的描述,下列哪一项是正确的()。
D
暂无解析
MarkTwainemployedanunpretentiousstyleof()inhisnovelswhichisbestdescribedas“vernacular”.
Moderneconomics________thecountry’sagriculturalpolicies.
Thereisanambiguityinthesentence“Heisahardbusinessman”dueto______.