孕8~12周易发生不全流产的主要原因是
A.雌激素分泌不足B.孕激素分泌不足C.绒毛膜促性腺激素分泌减少D.绒毛发育不良E.绒毛发育繁茂
参考答案:E
质量认证的依据为()。
A.目标、方针与产品的符合性
B.满足质量要求和目标方面的有效性
C.质量管理体系的要求标准
D.质量手册、程序文件、质量记录等
31._________reasonable, the idea he to create a friendly environment attracted much public attention.
A.Sounded; came about
B.Sounded; came across
C.Sounding; came up with
D.Sounding; came along