人工派单与系统自动派单相比多出的处理步骤为()
A、接单
B、回单
C、故障确认
D、归档
参考答案:C
Many a student ________ failed in the biology exam,and Tom is the only one of them who ________ decided to give up the course.
A.have;has
B.have;have
C.has;have
D.has;has
三角形螺纹的牙型角α=(),适用于(),而梯形螺纹的牙型角α=(),适用于()。