滚动轴承内圈与轴颈的配合以及外圈与座孔的配合( )。
A.全部采用基轴制B.全部采用基孔制C.前者采用基孔制,后者采用基轴制D.前者采用基轴制,后者采用基孔制
参考答案:C
— I’m sorry that I can’t go to your party tonight.
— ________? Haven’t we agreed on it?
A.What is it
B.Why don’t you
C.What do you think
D.How is it
触发器有什么特点?有哪些类型?