我国科学家已成功破译了水稻基因组的全部信息。下列叙述错误的是( )
A:水稻基因实质上是水稻DNA分子上起遗传作用的一些片段
B:水稻抗病、抗倒伏、高产优质等一系列可遗传的性状均由基因决定
C:水稻DNA分子是一种大分子化学物质,它们就是水稻的遗传物质
D:将来水稻体内的DNA不再可能发生任何变化
How do we know the weather? We learn it on the radio and TV every day. Different countries have different weather. For example, the weather in Australia is different from that in China. Because the seasons in Australia are the opposite. Its summer is from December to February. But in our country, it's winter this time. And its winter is in June, July and August. So when it's spring in China, it's autumn in Australia. Isn't it interesting?
甲、乙两种机器分利以固定速率生产一批货物,若4台甲机器和2台乙机器同时运转3小时的总产量,与2台甲机器和5台乙机器同时运转2小时的总产量相同,则1台甲机器运转1小时的产量,与1台乙机器运转几小时的产量相同?