单选题 Patient who are severely  ________ in vitamin A show a sign of night blindness.

单选题 During the first 24 hours of ankle sprain (脚踝扭伤), the application of ________ can help to reduce swelling.

单选题 Term means that a problem sending sound waves along the route through the outer ear and middle ear

单选题 The patient’s blood pressure is 170_____ 90 mmHg.

单选题 To prevent ________ after operation should be an essential part of care in hospital

单选题 Acquired immunodeficiency syndrome belongs to  ________ disease spread by blood, sex or mother to baby.

单选题 To sign ________ before surgery is necessary.

单选题 At the beginning, the patient with renal stone (肾结石) shows a sign of ______.