秤的计量性能主要包括灵敏性、鉴别力、鉴别力阈、耐久力()和重复性。
参考答案:稳定性
–Has your father returned from Africa yet?
–Yes, but he _____here for only three days before his company sent him to Australia.
A.has been
B.will be
C.would be
D.was
票据权利是双重请求权,持票人行使票据权利时,具有可选择性。( )