【单选题】以下描述RS232的电气特性正确的是( )。
A.
“1”:-3~-15V,“0”:+3~+15V
B.
“1”:>2.4V;“0”:<0.4V< /div>
【判断题】球化退火可用于亚共析钢,降低硬度,便于切削加工。
【简答题】Payment must be available in immediately available funds on the due date at the place where the draft or documents are payable,provided such due date is a banking day in that place.If the due date is ...
【单选题】龙山黄酒厂2019年7月销售散装黄酒40吨,取得含增值税价款192100元,计算该厂当月应纳消费税税额为( )元。