茄科蔬菜苗期主要病害有()、()、(),以及有低温引起的生理性病害()。
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A. 正确
B. 错误
You are in a tropical port. The refrigeration machinery on a container loaded with air-cooled fruit fails. It cannot be repaired for 18 to 24 hours. Which step should you take to reduce the temperature rise and spoilage of the fruit?().
A. Discharge a cylinder of nitrogen into the container
B. Shade the container and periodically hose it down
C. Seal any ventilation openings and add dry ice
D. Spread ice over the top layer and in any voids within the container
小进化的基本材料是:()
A. 饰变
B. 表型可塑性
C. 突变
D. 表型模拟(拟表型)