准试验设计和试验设计的区别在于（ ）。
A．样本分配的随机性
B．数据统计的准确性
C．试验结果的可靠性
D．培训内容的实用性
参考答案：A
.— This is one of the oldest trees in the world.
—_____ such a big tree.
A．Never I have seen
B．I haven't never seen
C．Never have I seen
D．I have seen never
DOMC290系统的告警上报流程是什么？
