RS232是一种常用的串行总路线标准,它规定逻辑“0”对应的电平是()。
A.0~+1.8V
B.+2.8~+5V
C.+3~+15V
D.-15~-3V
参考答案:C
企业在安排流动资产数量时,只安排正常需要量,不安排或只安排很少的保险储备量。这种资产组合策略是:
A.适中的资产组合策略
B.保守的资产组合策略
C.冒险的资产组合策略
D.稳健的资产组合策略
— On summer nights, the weather is usually hot at night in the south of China.
— Yes, so I often go to sleep ______ the window ________.
A.let, open
B.with, opened
C.with, closed
D.with, open