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[多选题]
4000kg级索道工作索的牵引索。牵引索适宜选用线接触或面接触同向捻钢丝绳,其钢丝公称抗拉强度不宜小于()。牵引索的直径:双承载索应不小于()mm。
A.1670Mpa
B.1770Mpa
C.16
D.18
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A.1670Mpa
B.1770Mpa
C.16
D.18
A.3~6min
B.4~7min
C.5~8min
D.6~9min
①建立牵引系统、架设猫道;②主缆索股牵引;③单端冷铸锚头的制作;④整形;
⑤线形调整;⑥主缆定型;⑦安装索夹、吊索;⑧吊杆的安装
A.③①②⑥④⑤⑦⑧
B.⑦⑧①②④⑤③⑥
C.①②③④⑤⑥⑦⑧
D.①②④⑦⑤⑥⑧③
A.采取头低臀高位,立即行剖宫产术
B.行外转胎位术后待自然分娩
C.吸氧,胎心恢复后立即行剖宫术
D.静脉滴注缩宫素,宫口开全行臀牵引
E.行内转胎位术后待自然分娩