0.5h | 1.0h | 1.5h | 2h | |
对照组 | 1 | 2 | 4 | 4 |
曝气无水草 | 0 | 1 | 2 | 4 |
无曝气无水草 | 0 | 1 | 2 | 4 |
曝气有水草 | 0 | 1 | 3 | 4 |
注:肠道饱满植株与肠道充塞度的大小均代表摄食效率的高低
A.在自然生存环境下,中华绒螯蟹作为生态系统成分中的分解者和消费者 |
B.在表1的实验中,对照组在曝气无水草的摄食条件下投喂人工合成饲料 |
C.在表1的实验中,实验组应该以絮凝物浓度800~900mg/L喂养 |
D.由表1可知,曝气有水草摄食条件下更利于蟹的摄食 |
同类型试题
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2