某女,16岁初潮,经量极少,婚后2年未孕,考虑为幼稚子宫。下列哪些临床表现与幼稚子宫不符()
A. 第二性征正常
B. 不孕
C. 宫体与宫颈之比2:3
D. 反复流产
E. 子宫较正常小,极度后屈
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试述辩证的否定观和形而上学否定观的区别并说明怎样正确对待我国的历史文化遗产和外国文化。
The Navigation Rules state that a vessel shall be operated at a safe speed at all times so that she can be stopped within().
A. The distance of visibility
B. 1/2 the distance of visibility
C. A distance appropriate to the existing circumstances and conditions
D. The distance that it would require for the propeller to go from full ahead to full aster
炼油装置加热炉应布置在焦炭塔全年最小频率风向的上风侧。加热炉烟囱与焦炭塔顶操作问距离小于15m时,加热炉的烟囱出口应高于焦炭塔顶()m。
A. 3
B. 2
C. 1
杂志广告的表现类别主要分为(),企业或()型,()型,()型,()型以及()型等六种