做铁丝在氧气里燃烧的实验时，预先在集气瓶里装少量水或细沙所起的主要作用是请选择DCBA5{1l2Y:W+D0C,L/e+B2X:[7n/P")?*P;l/^*|;y7n-e2M.D8i9O9o+L-p
A．防止瓶底炸裂)?*P;l/^*|;y7n-e2M.D8i9O9o+L-p
B．降低瓶内温度)?*P;l/^*|;y7n-e2M.D8i9O9o+L-p
C．增加氧气含量)?*P;l/^*|;y7n-e2M.D8i9O9o+L-p
D．吸收生成的物质)?*P;l/^*|;y7n-e2M.D8i9O9o+L-p