心室复极的方向是()
A.心内膜向心外膜方向推进
B.心内膜与心外膜同步复极
C.心外膜向心内膜方向推进
D.室间隔向心室内膜推进
E.右心室向左心室方向推进
参考答案:C
Which of the following signs and symptoms is classic for a patient with rheumatoid arthritis()
A. Joint swelling, joint stiffness in the morning, and bilateral joint involvement.
B. Crepitus, development of Heberden’s nodes, and anemia.
C. Pain on weight-bearing, rash, and low-grade fever.
D. Fatigue, leukopenia, and joint pain.
相对而言,以下哪类包装材料使用不是很普遍______。
A.木材B.纸C.塑料D.陶瓷