测量设备在规定的标准条件下使用时产生的示值误差称为（）。
A.系统误差
B.基本误差
C.附加误差
D.随机误差
参考答案：B
The number of people invited _____ fifty, but a number of them _____ absent for different reasons. [ ]
A. were; was
B. was; was
C. was; were
D. were; were
追索是指汇票遭到拒付时，持票人要求其前手背书人、出票人、承兑人或其他的汇票债务人、清偿汇票金额及有关费用的行为。 ( )
