心绞痛与急性心肌梗死的鉴别诊断要点包括（）
A.心力衰竭
B.血压
C.心包摩擦音
D.疼痛
E.肺水肿
参考答案：B, C, D, E
–Bruce, I really appreciate your handwriting.
- _______. .
A．I practice every day
B．Thank you very much
C．No, I don’t think so
D．Well, it’s not good enough
齿轮设计时，选齿宽系数，小齿轮，大齿轮，故大齿轮齿宽。
- _______. .