手持式电动工具的负荷线应采用耐气候型的＿。
A.多股绝缘铜线
B.橡皮护套铜芯软电缆
C.塑料铝线
D.塑料护套铝芯软电缆
参考答案：B
Once he has determined _____ something, no one can change his mind. [ ]
A. to do
B. doing
C. to have done
D. having done
初产妇，孕40+1周。规律宫缩22小时。体检：LOA，胎心168次／分，宫缩20秒/6～8分钟，骨盆外测量正常，宫口开大4cm，头S+2。诊断不正确（）
A.滞产
B.宫缩乏力
C.胎儿宫内窘迫
D.可疑头盆不称
E.中骨盆狭窄
