法律与纪律,是人类摆脱愚昧、走向文明的重要标志。
参考答案:对
50. Teachers should be _____ with their students but should not be _____ on them.
A.hard; strict
B.strict; hard
C.hardly; strictly
D.strictly; hardly
动态观察血浓度,可作为检查胎盘功能指标的是()
A.耐热性酸性磷酸酶
B.雌激素E2
C.缩宫素
D.孕激素
E.绒毛膜促性腺激素