-What ______ doing?
-They're drinking tea.[ ]
A. are they
B. is he
C. they are
答案:A
必须用X线片检查诊断的疾病是
A.咬合面龋B.急性牙髓炎C.慢性牙髓炎D.急性根尖周炎E.慢性根尖周炎
病综合征并发电解质紊乱最常见的是()。
A.低钠
B.低钾
C.低钙
D.低镁
E.高钾