弗洛伊德的古典精神分析理论大致可以分为哪三个发展时期?
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好的实验指标首先考虑的是()
A. 客观性
B. 灵敏性
C. 合理性
D. 特异性
以下哪一项不属于前三点式起落架的优点()
A. 重量较轻
B. 地面运动的稳定性好
C. 飞机重心位于主轮前边,有助于阻止飞机滑行时打地转
D. 着陆时只需主轮先接地,比较容易操纵
Which method should be used to secure a manila line to bitts().
A round turn on the bitt farthest from the strain and then figure eights
B. A round turn on the bitt closest to the strain and then figure eights
C. Figure eights and then a round turn at the top of both bitts
D. Only figure eights are necessary on both bitt
突出矿井采掘工作做到(),()。未按要求采取区域综合防突措施的,严禁进行采掘活动。