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【单选题】
在同一地方测得6名8岁男童的身高(cm)分别为120.5,121,118,123,119,130,这6个值大小不等的原因是( )A.
个体变异
B.
抽样误差
C.
过失误差
D.
系统误差
E.
测量误差
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举一反三
【单选题】In restricted visibility, a vessel which detects by radar alone the presence of another vessel shall determine if a close quarters situation is developing or risk of collision exists. If so, she shall...
A.
sound the danger signal
B.
when taking action, make only course changes
C.
avoid altering course toward a vessel abaft the beam
D.
All of the above
【简答题】安静时主要产热器官是 ______ 。 运动时 主要产热器官是 ______ 。
【单选题】Which vessel shall avoid impeding the safe passage of a vessel constrained by her draft?_____.
A.
A vessel not under command
B.
A fishing vessel
C.
A vessel restricted in her ability to maneuver
D.
All of the above
【简答题】项目质量的双重性是指
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