用于托收的票据如果无特别注明,大多数票据自出票日期起()个月内有效。
A、1
B、2
C、6
D、12
参考答案:C
A.To help him explain the information to his roommate.
B.To help him write a paper.
C.To prepare for a test.
D.To tell her if the notes are accurate.
游标卡尺可以用来测量(),()、内径等几何量。