单项选择题
But for the favorable weather, we ___ in such a good harvest. A. can not get B. could not get C. couldn't have got D. could have got
多项选择题 实验室的重要守则有?
单项选择题 图2-7控制电路中,图( )按正常操作时,出现点动工作状态。A. 图(a)B. 图(b)C. 图(c)
判断题 常用的教学方法有以实际操作训练为主的教学方法。( )正确错误