A.月经来潮12h内进行诊断性刮宫
B.开腹探查
C.子宫输卵管碘油造影
D.阴道镜检查
母树经摘顶后10天左右、即可剪取穗条。适宜用作穗条的新梢标准是:长度在25厘米以上,茎粗3-5毫米,2/3以上己半木质化;呈棕色或黄绿色()。
A.-136.5
B.-138.5
C.-140.5
D.-142.5
根据气力输送的特点,降低动力消耗,节约能源是一个重要的研究课题,从经验中知,管道内径是关于能耗的重要参数。直观上看,当输送量一定时,管径过小,输送易阻滞,管径过大,虽输送畅通,但又造成能量的浪费。根据经验,把管径分成三组,各组的试验结果如下表所示,试用方差分析法比较各组的效果.
管径(mm) | 单位功耗 |
230 | 0.0308,0.0476,0.0504 |
250~260 | 0.0532,0.032,0.0218,0.028,0.028, 0.042,0.0336,0.042,0.042,0.028 |
280~320 | 0.07,0.07,0.0644,0.0312,0.0756,0.0756, 0.07,0.0588,0.0588,0.042,0.0308,0.0364, 0.0448,0.21,0.154,0.1064,0.1288,0.112, 0.1064,0.1288,0.0756,0.0644,0.0504,0.0644, 0.0504,0.0308 |
方案 | 投资额 | 利润 | 概率 | 概率 |
甲(新建) | 20000元 | 好,前3年8000,后5年12000 | 好:0.8 | 好:0.9 差:0.1 |
差,前3年(-3000),后5年(-2000) | 差:0.2 | 好:0.3 差:0.7 | ||
乙(扩建) | 8000元 | 好,臆3年5000,后5年7000 | 好:0.8 | 好:0.9 差:0.1 |
差,前3年(3000)后5年(2000) | 差:0.2 | 好:0.3 差:0.7 |