正常机体对酸碱平衡机制中最迅速的途径是()。
A.肺
B.血液缓冲系统
C.细胞内外阴阳离子
D.肾
E.肾素-血管紧张素-醛固酮系统
参考答案:B
—We were surprised to hear that the reason________ she gave for her absence was________ her mother was ill.
—Yes,we saw her mother was at the supermarket that morning.
A.why;that
B.which;that
C.that;because
D.why;because
男,45岁,主述右下后牙咬合痛1周。检查发现下颌右侧第二磨牙远中邻面为金属嵌体修复,远中边缘嵴有裂缝,舌尖高陡,颊尖低平,咬合较紧,叩诊疼痛较明显。X线片显示已行牙髓治疗,但未做根管充填。
对确定治疗方案起决定性作用的检查是()
A.X线片
B.叩诊
C.牙周探诊
D.拆除修复物后探查
E.调后观察