单项选择题

黄瓜黑星病菌侵入寄主的适温为（）。
A、20-22℃
B、25-27℃
C、28-30℃
D、31-33℃

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单项选择题

电子加速踏板传感器的工作电压为12V
A、正确
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单项选择题

Which question was not proposed in the fable about ‘Nie Que asked Wang Ni three questions, none of which were answered’ in the chapter of Qi Wu Lun?

A．Who knows what the best habitat is?
B．Who knows what the best beauty is?
C．Who knows what the best taste is?
D．Who knows what the best opinion is?