下列哪种疾病,无单侧膈肌抬高表现()
A.急性脊髓灰质炎
B.带状疱疹病毒感染
C.肺底积液
D.肺梗死
E.胸主动脉瘤
参考答案:C
It is reported that large amounts of locusts(蝗虫) _____ in their activity in the north now.
A.is
B.are
C.was
D.were
下列哪项不符合矫治器的基本要求()
A.容易洗刷、便于清洁,不影响口腔卫生
B.矫正器对口腔软、硬组织及颌面部无损害
C.不与唾液起化学反应、不影响牙颌面的正常生长发育和功能
D.结构简单、牢固、发挥弹力好,力量易于控制,效果好
E.恢复缺损部位的外形,改善面容