求19.904的近似数,保留整数是______,精确到百分位是______.
求19.904的近似数,保留整数是20,精确到百分位是19.90;
故答案为:20,19.90.
____ in peace, Hawaiians have developed ____ third sign of friendship. [ ]
A. To live; a
B. Living; a
C. Lived; the
D. To live; the
覆盖义齿的优点是().
A.覆盖义齿稳定性好
B.覆盖义齿固位力强
C.保护口腔的软硬组织健康
D.减轻患者痛苦
E.以上都是