[tex=32.929x1.286]kX4Byg//c5byCo2b8W2Rm+wpZton3H35hSt4IyMOuTVsTjAayyXsLP/tuFmH4NNMgdFxPn6qCN1SbJY8QbkT/iLDrQKYqtZ3hQmOkh4BcLuG8WwaHXrEu8RFvZy5R3fcPxk1xuG3uVCwXifO90eGbA==[/tex][tex=17.429x1.286]hrfDHNPsZrPfpALg4Ghj5X9TsmZ34Fw5gFSPZszzYusBkP+Ml51GmzpVPP2yJOw7a2vRKs7im2r0jKAYnsYlvCiCwjMc+2kiZTR0YDYu0kI=[/tex]

下列选项为某变速器一、二、三、四挡的传动比，则三挡的传动比为（）。 A: 0.969 B: 1.286 C: 1.944 D: 3.455

[tex=17.429x1.286]vN5jjf/5dGimJKfn99jsj/9XMnOZEYkUbPF+M8tppqfBEq/mnjk+eglru1xtkmJtQYDkHBkJNLKENYyZ+1Wh7w==[/tex][img=287x174]179c070abba4eee.png[/img] 未知类型：{'options': ['0.5', '0.6', '1.0', '0.707'], 'type': 102}

[tex=17.429x1.286]NmhHJOPFbxqYHLUAY39yBiLYla4OMmtApSeBbG1N7Qo5V6i5lH+0YnjX/locDc9NevlTzhZr5SMp4zbK2jwpZQ==[/tex][img=326x187]179c06f0df221f0.png[/img] 未知类型：{'options': ['[tex=3.714x1.357]HFcCDKeBOmSQZNd0WJyQ+L2yaY1BJsVHcainFlq4StU=[/tex]', '[tex=3.714x1.357]iH8a9CwtSAPAUVPmmeZ7fbWYWH+xtfQiY8vRbnRTAQk=[/tex]', '[tex=3.714x1.357]uPqB69t/YCBtGKYZEsK4vkeznKRr0ahWJbq9fyab9ik=[/tex]', '[tex=3.714x1.357]rnpVuSG5/rZcVVpCT8cSRT2b46it77wPR53ZM1jri/w=[/tex]'], 'type': 102}

[tex=17.429x1.286]vN5jjf/5dGimJKfn99jsj/9XMnOZEYkUbPF+M8tppqcYBWTzUPbzbzBwUYRCIWC+h2X2H4D8ehOmM2rB8+X2vA==[/tex][img=186x132]179c52b3a606e10.png[/img] 未知类型：{'options': ['[tex=5.286x1.357]pB8zKbjWl0T3QcB5wnXJ8BC7sBAGlYyRNkw2reSrx/8=[/tex]', '[tex=5.286x1.357]pB44y1tEQLYE+VMzyXaRaq/t2Bg41fWqVpdwI83zePg=[/tex]', '[tex=3.714x1.357]JQZS422LLOYi34NnC+ansVQV35V5Iu5Uk/Q8kXZPUsE=[/tex]', '[tex=3.714x1.357]cD83MrxHps8DuecsOrCRBK9EOm7x1Svki+Jeb542VK4=[/tex]'], 'type': 102}

[tex=17.429x1.286]NmhHJOPFbxqYHLUAY39yBiLYla4OMmtApSeBbG1N7Qo5V6i5lH+0YnjX/locDc9NevlTzhZr5SMp4zbK2jwpZQ==[/tex][img=277x190]179c0fe055deb58.png[/img] 未知类型：{'options': ['[tex=3.714x1.357]Y1ro6CESsNuSWlZGJzNYj3/5UgBJfzguohNnhYz1Qf4=[/tex]', '[tex=3.714x1.357]JQZS422LLOYi34NnC+ansVQV35V5Iu5Uk/Q8kXZPUsE=[/tex]', '[tex=5.286x1.357]/Ry8PRJ1yhXX5LjfN5uxwq5RK7i6eYZKD/YXMcL0PfY=[/tex]', '[tex=5.286x1.357]pB44y1tEQLYE+VMzyXaRaq/t2Bg41fWqVpdwI83zePg=[/tex]'], 'type': 102}

[tex=15.0x1.286]yvRcWaoUr4J9O/xdhox1SQuHxeybsSeRHYC5wVDJgDjUSHXQPV8HtbFL0kuBqtWDXKSs4wnK3+FK1cHrtqMm7A==[/tex] 未知类型：{'options': ['[tex=13.143x1.286]uK9FRNUDG8gt6xmb0ymmwZyU+5wwWJY4XnVcAwuKawTp+X9l5eGekcBZfCthoVck[/tex]', '[tex=17.429x1.286]b667zMfpalkRSs1RHKwDXFNI0BHJneRY8mIXMGUO4mjtKzNR5Vml/qhge0faqNkLfEq97WFznL6vt6+BfrMnIg==[/tex]', '[tex=13.571x1.286]oOfa/sXvpvwdjz6jepy19KLBzMjbVTrKWEzL5sfWnqdu3n/qB3sWhClPTJDCO/f1[/tex]', '[tex=12.571x1.286]YjxvBhVg5PDcZs74Bu2YMkyl4rIrAkb6z/3VAFdx0wbseh9nvfUniswhp92BDJDj[/tex]', '[tex=18.214x1.286]Pu9Nb+udbUPRKx2/Z8HeYjXeSVBNp+XDR2veiRRuWTiUrQFOzrdo5nQQCnrr9xutY7+EGljdZ1mEJ82uTfSfjQ==[/tex]'], 'type': 102}

[tex=17.429x1.286]VoKfr1IIzGJmh8L2l120JqjixkQ1tL3XlyBgbwU9pvS9UKZRTovLmaVq8Zv4SelU6NNNx16xNXr2asYvjnme4w==[/tex][img=310x163]179b0f602527037.png[/img] 未知类型：{'options': ['0.5 s(2) 1 s(3) $2 s$(4) $4 s$', '\xa01 s(3) $2 s$(4) $4 s$', '2 s(4) $4 s$', '4 s'], 'type': 102}

据以往资料表明，某一3口之家，患某种传染病的概率有以下规律：[tex=11.714x1.286]SgmLkVYvgsuVYwVX1tUOuKa8Ufp4N1qAYKl1Zi5lekvaQCHFHF7v4Q6scmdumt9o[/tex]，[tex=17.429x1.286]z5V9/flsDnxvNFR6gB9jtg3puOEqsBWxVcG53Si1T7Nj+DaaRPfb/LZXrz12u0FNFmDdtPsHgrH4kxf+6gaLjQ==[/tex]，[tex=21.143x1.286]uVkkHDaSkNHFFMadwUzzYpji30N7JfRuTtCLbgZ42t0lHJ/+uA8ggyjxinh3jqNNuzg/HbmZdE5SVv1wc3w+rjHorY8I+tJY041mWr8UEEM=[/tex]。求母亲及孩子得病但父亲未得病的概率。

下列变量组（）是一个闭回路。 A: {x，x，x，x，x，x} B: {x，x，x，x，x} C: {x，x，x，x，x，x} D: {x，x，x，x，x，x}