题目内容

使用温度为40-90℃、体积为种子2倍的热水烫种,可将携带的病菌、虫卵杀死。

A. 对
B. 错

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一般种子层积处理时的温度为0-10℃.

A. 对
B. 错

热水烫种时对水温的要求是60--70℃.

A. 对
B. 错

浸种催芽时的用水量一般为种子体积的2-3倍。

A. 对
B. 错

Which of the following statements about VOR is TRUE according to the text?

A. VOR signals are more easily affected by terrain feartures and coastlines.
B. VOR signals can nottravel beyond the horizon.
C. VOR signals are only useful in perfectly clear days.
D. VOR signals are limited by the sight of the pilots .

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