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问题 选择题
3A的直流电通过电阻R时，t时间内产生的热量为Q；现让一交流电通过电阻R，若2t时间内产生的热量为Q，则该交流电流的有效值和最大值分别为（　　）

A．I有=3/2A，Im=3A

B．I有=3A，I有=3A

C．I有= A，I有 A

D．I有3A，Im=6A

答案

答案：A

默写题

默写古诗词，并按要求解释诗句。

乡村四月

                                      

                                       

                                       

                                       

       前两句诗意：                                                                                                                              

                                                                                                                                                          

四时田园杂兴 

                                      

                                       

                                      

                                        

       前两句诗意：                                                                                                                                 

                                                                                                                                                             

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单项选择题 B1型题

肩关节周围炎检查中，前锯肌瘫痪者上肢向前平举时表现为（）

A.平肩

B.翼肩

C.方肩

D.肩关节半脱位

E.疼痛弧试验阳性
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