More than one worker _____ dismissed. [ ]
a. have been
b. are
c. has been
d. has
c
由于模具结构的需要,凸模的长度大于(),或凸模工作部分直径()允许的最小值,就应该采用凸模护套等方法加以保护。
用于胎盘功能检查错误的是
A.羊水中卵磷脂
B.孕妇E3
C.孕妇血清胎盘泌乳素
D.孕妇OCT
E.孕妇NST