问答题

1 制定萝卜常规制种的技术方案？

答案：（1）种株培育
（2）种株选择
（3）种株冬藏
（4）土地准备
（5）定植管理
（6）收获采种

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单项选择题

A uniform magnetic field is directed along the x axis. or what orientation of a flat, rectangular coil is the lux through the rectangle a maximum?

A．is a maximum in the xy plane.
B．It is a maximum in the xz lane.
C．It is a maximum in the yz plane.
D．The flux as the same nonzero value for all these orientations.
E．The flux is zero in all cases.

单项选择题

The six strings of a guitar are the same length and under nearly the same tension, but they have different thicknesses. On which string do waves travel the fastest?
A、 The thickest string.
B、The thinnest string.
C、The wave speed is the same on all strings .
D、None of these.