题目

如图所示，甲、乙两个完全相同的杯子里面装满水，乙上浮一木块，则水对杯底的压强大小关系为 A．        B．        C．        D．无法确定 答案：C---Hello, may I speak to Mary please?  --- __________. A．I’m Mary.B．Yes, please.C．Who are you?D．Hold on, please.