单项选择题

Which of the following expressions is true?（） A. B. C. where is constant D. where is constant

你可能感兴趣的试题

信号发生器模拟单片机输出PWM信号，信号输入采用____、耦合方式：

答案：直流

单项选择题

According to the etiquette mentioned in the lecture, which one is improper?
A、Mr. Bingley danced with Jane twice.
B、Mr. Bennet visits Mr. Bingley first, and then introduces him to the female family members.
C、The five Bennet girls are out in society at the same time.
D、Elizabeth goes to Netherfield to take care of her sister.