甘蔗节菱孢霉产生的毒素为(),是一种神经毒,主要损害中枢神经系统。
参考答案:3—硝基丙酸
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Lewis searched for his ID card for a whole day last Sunday, but it ____ in his pocket the next day.
A.turned up
B.turned over
C.turned on
D.turn out
如图甲所示,一条电场线与Ox轴重合,取O点电势为零,Ox方向上各点的电势随x变化的情况如图乙所示。若在O点由静止释放一电子,电子仅受电场力的作用,则
A.电场是匀强电场
B.电场的场强先减小后增大
C.电子将沿Ox正方向运动
D.电子的电势能将增大