Those consumers with similar needs, behaviours and preferences can be grouped together to form different smaller segments. （）
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A segment is less attractive, if ____.
A. it has few strong and aggressive competitors
B. it is relatively difficult for new comers to enter
C. it is already packed with many strong and aggressive competitors
D. it is too easy for new comers to enter
When evaluating different market segments, a company must pay attention to three factors. They are____.
A. company objectives and resources
B. company size
C. segment structural attractiveness
D. segment size
单选题：为防止立式安装的执行元件及和它连在一起的负载因自重而下滑，常采用（）。
A. 调压回路
B. 卸荷回路
C. 背压回路
D. 平衡回路
判断题：直控顺序阀利用外部控制油的压力来控制阀芯的移动。
A. 对
B. 错
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