单项选择题 演奏下滑音时右手何时触弦最佳?( )
多项选择题 Central-point difference algorithm call format is[dy,dx]=diff_ctr(y, Dt, n), the following statements are correct ( ). A、y is the vector containing measured data for evenly distributed points B、n specifies the order of derivativ C、the argument dx is the corresponding vector of independent variables. D、
单项选择题 在应付款系统的制单功能中,不能完成的操作是()。A. 合并制单。B. 查看单据。C. 选择凭证种类。D. 修改凭证摘要。