在润滑分类中,()是一种最不理想的,最常见的润滑状态。
A.液体润滑
B.边界润滑
C.半液体润滑
D.内部润滑
参考答案:C
she is not so cheerful she used to be?
A.How is it that; as
B.Why is it that; what
C.Is it why; that
D.How it is what; as
治疗过敏性休克应首选()
A.抗组胺药
B.肾上腺素
C.糖皮质激素
D.异丙肾上腺素
E.多巴胺