The force for axoneme bending is derived from the A: sliding movement of central pair microtubules. B: contraction of central pair microtubules. C: sliding movement of outer doublet microtubules. D: contraction of outer doublet microtubules.

The force for axoneme bending is derived from the​ A: sliding movement of central pair microtubules. B: contraction of central pair microtubules. C: sliding movement of outer doublet microtubules. D: contraction of outer doublet microtubules.

若定义doublet;，则表达式t=1,t+5,++t的值为