直流输电系统保护配置的原则为()。
A.可靠性
B.灵敏性
C.选择性
D.快速性
参考答案:A, B, C, D
— The food looked bad, but it ________ OK.
— So we can’t judge a man by his appearance.
A.is tasted
B.tasted
C.was tasted
D.taste
引产时利凡诺的剂量是()
A.50~100mg
B.100~200mg
C.25~50mg
D.100~150mg
E.100~200mg