function Rguji=shixi2_2(t,thetaa1,thetaa2,thetab1,thetab2,thetac,mm)

t 是要求系统生存的寿命 thetaa1 是元件A1的数学期望

thetaa2 是元件A2的数学期望 thetab1 是元件B1的数学期望

thetab2 是元件B2的数学期望 thetac是元件c的数学期望

mm 是随机实验次数

frq=0 -function Rguji = shixi2_2 (t, thetaa1, thetaa2, thetab1, thetab2, thetac, mm)　t is to require the system to survive life　thetaa1 element A1 is the mathematical expectation　thetaa2 element A2 is the mathematical expectation　thetab1 is a mathematical element B1 expectation　thetab2 element B2 is the mathematical expectation　thetac component c is the mathematical expectation　mm is a random number of experiments frq = 0