问题 多项选择题

同步电动机发出不正常的响声,产生机械脉振其原因可能是()

A.电网电压低,“SBZ失步再整定”可控硅装置失控。

B.励磁电压高或失步。

C.机械负荷过重。

答案

参考答案:A, C

材料分析题

物理课上,王老师正在给同学们讲解难点,这时有几位调皮的男同学又说又笑,影响了课堂秩序,王老师非常气愤,他认为张强同学带头说笑且闹得最欢,就点名严厉地批评了他。可张强认为老师是当众给他难堪,就大声与王老师顶起嘴来,并指责老师为什么不点其他同学,只点他的名字。为了不影响教学进度,王老师让张强先出去,张强就是不出去。无奈之下只好把班主任叫来才领走了张强。

阅读材料,回答问题:

(1)王老师在课堂上批评说笑的同学对不对?为什么?

                                                                                                                                                             

                                                                                                                                                             

                                                                                                                                                                (2)假如王老师确实误解了张强同学,张强应该怎样与老师沟通?为什么?

                                                                                                                                                               

                                                                                                                                                               

                                                                                                                                                               

(3)正确的师生关系对青少年的健康成长有什么影响?

                                                                                                                                                                

填空题