关于聚酯片基的特点，叙述错误的是
A. 熔点髙
B. 热稳定性好
C. 化学稳定性低
D. 收缩性低
E. 弹性高
患者，男，56岁，拔除2颗磨牙后出院。患者唯一正在服用的药物是治疗抑郁症的帕罗西汀。该患者的镇痛中不适合使用可待因，原因是（）。
A. 可能无效
B. 可能引起过度镇静
C. 持续时间短
D. 术后恶心风险增加
E. 罹患五羟色胺综合征的风险增加
A liner in riveted construction of a vessel is a(n)().
A. Small plate which fills the aperture between riveted strakes and the vessel framing
Backing plate which is used to level the strakes while riveting，and then removed
C. Internal frame. to which the side shell is riveted
D. Seam that is welded after riveting is completed
何谓咳嗽变异型哮喘(Cough variant asthma)？
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