若标称30KVA的三相变压器,最大使用的三相电流是多少()
A.40A
B.45A
C.50A
参考答案:B
He was deep in thought with his eyes_____ on the ceiling.
A.fixed
B.fixing
C.fix
D.to be fixing
患者,女性,25岁,孕6周,行人流术中,突然感到头晕、胸闷。查体:面色苍白,血压80/55mmHg,心率56次/分。该患者的治疗方案为()
A.肌注异丙嗪25mg
B.肌注氯丙嗪25mg
C.肌注哌替啶25mg
D.肌注阿托品0.5mg
E.肌注异丙嗪及哌替啶各半量