在等边三角形、正五边形、正六边形、正七边形中,既是轴对称又是中心对称的图形是[ ]
A.等边三角形
B.正五边形
C.正六边形
D.正七边形
答案:C
Mr. Smith’s never angry with their daughter. __________ Mrs. Smith.
A.So is
B.So has
C.Neither is
D.Neither has
胎盘功能不良的表现有().
A.连续监测24小时尿E3值减少30%~40%
B.尿E/C>10
C.SPl>100mg/L
D.胎盘生乳素>4mg/L
E.尿E