By the time he got there, the party . [ ]
A. begin
B. began
C. had begun
D. has begun
答案:C
直流测速发电机,若其负载阻抗值增大,则其测速误差就增大
企业进口应税物资在进口环节应交的消费税,应该计入该项物资的成本。( )