In some countries, very important to be on time. [ ]
A. it
B. it's
C. its
D. that's
答案:B
妊娠期母体变化哪项是错误的()。
A.妊娠32~34周血容量达高峰
B.妊娠晚期易发生外阴及下肢静脉曲张
C.子宫峡部在妊娠后期形成子宫下段
D.妊娠末期孕妇血液处于低凝状态
E.妊娠后卵巢不排卵
肯氏四类牙列缺损,义齿最佳就位方向是
A.由前向后B.由后向前C.垂直向D.旋转E.侧向