【单选题】The right coronary artery arises from
D.
orifice of the coronary sinus
【单选题】三相异步电机存在转差率的原因是()。
A.
为了产生作用于转子的电磁力矩,转子必须保证有切割旋转磁场磁力线的相对运动。
【单选题】在精馏塔中的图解计算中,若 q 值发生变化时,下列哪些会发生变化?
【单选题】A 35-year-old woman has a reputation as a perfectionist. She has angina pectoris of 6 months’ duration. On physical examination, her blood pressure is 135/85 mm Hg. She is 168 cm (5 ft 5 in) tall and ...