单项选择题

（10分）三相全控桥整流电路，电阻负载时的控制角α移相范围是（）。
A、0°～120°
B、0°～90°
C、0°～150°
D、0°～180°

你可能感兴趣的试题

单项选择题

Economists have developed models of risk aversion using the concept of

A． utility and the associated assumption of diminishing marginal utility.
B． utility and the associated assumption of increasing marginal utility.
C． income and the associated assumption of diminishing marginal wealth.
D． income and the associated assumption of increasing marginal wealth.

单项选择题

强化理论理论中负强化是指（）
A、奖励
B、惩罚
C、撤销负面结果
D、撤销某一行为的正强化