蔬菜种子的发芽势反映了种子发芽的速度和发芽的整齐度。
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要验证绿色植物在呼吸过程中放出二氧化碳，必要的实验条件是（）
A. 在黑暗条件下实验
B. 用一株叶片多的植物
C. 把植物置于适宜温度和光照条件下
D. 用一株幼小的植物
On open lifeboats，the purpose of the wire stretched between the davit heads is to（）.
A. keep the movement of the davits at the same speed
B. keep the davits from slipping when they are in the stowed position
C. prevent vibration during lowering of the boat
D. support the manrope
232年春，蒙古军和金军在钧州以南的（）进行大战，金军精锐尽失。
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