水润滑式长轴深井泵传动轴的各支承点采用水润滑的橡胶轴承。
参考答案：对
将下列人物与其称号相连接。
1．武圣 ①孟轲
2．亚圣 ②陆羽
3．茶圣 ③吴道子
4．画圣 ④关羽
5．医圣 ⑤张仲景
An analyst does research about sampling. Compared to estimates of parameters produced from simple random sampling, estimates of parameters produced from stratified random sampling most likely have:
A. less precision.B. the same precision.C. greater precision.
