如何分析泵抽空电流卡片？_爱下问搜题

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问题问答题简答题

如何分析泵抽空电流卡片？

答案

参考答案：

图4—5所示泵抽空电流卡片表明，沉没泵因抽空而自动停泵，自动启动因欠载未成功。图上仍将曲线分成4、B、C、D四段。由曲线A、B、C三段可以看出，沉没泵运行电流非常平稳。但D段曲线表明，因无井液进入泵的吸入口，所以电流急剧下降并自动停泵。从图4—5中可以看出，下午2时因抽空欠载而停泵，在延时继电器的作用下，到下午3时又自动启动。停泵延时周期的长短，视井内产液情况而定。

填空题

1) ______ the Oral Approach
2) ______ the Audiolingual Approach
3) ______ the Cognitive Approach
4) ______ the Natural Approach
5) ______ the Communicative Approach
a) Rule learning, meaningful practice and creativity are the focus of classroom teaching.
b) Some of the skills are developing listening, giving oral presentation, project work, role play and stimulation.
c) It employs situations for presenting new sentence patterns and drill-based manner of practising them.
d) In class students are asked to first listen to a dialogue, then repeat and memorize it.
e) When learners are ready to begin talking in the target language, the teacher provides comprehensible and simple response opportunities.

单项选择题

当拉下一个应急出口门把手盖板时，指示灯亮说明（）

A.滑梯释放机构处于待命状态；

B.滑梯释放机构已被脱开；

C.可以打开应急出口门。