2) black speck
黑点,黑斑
3) black marking
黑色斑
1.
Selection and breeding of sex-limited silkworm strain of normal marking of Japanese strain using black marking silkworm as parent
利用黑色斑蚕作亲本、选育日系普斑限性品系
4) brown or black spots
棕黑斑点
1.
Causes of brown or black spots in brass barrel plating of small hardware were analyzed and some counter measures were put forward.
分析了小五金产品滚镀黄铜层易产生棕黑斑点的原因,论述了黄铜层出现棕黑斑点是零件基材腐蚀的开始。
5) Gaeana maculata
斑点黑蝉
1.
Primary Investigation Rrport of Gaeana maculata on Acacia mangium Willd;
马占相思斑点黑蝉观察研究初报
补充资料:斑点叉尾鮰
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俗名: | 沟鲶、河鲶。 |
产地及产期: 原产于美国密西西比河,重点分布在伊利湖、.安大略湖、安艾达湖以及其它河流和附属水体内,通过驯养已成。 | |
介绍: 体延长,后部侧扁,头部平扁,尾叉较深。胸鳍有一硬棘,末端较尖,背鳍短,有脂鳍。体表光滑无鳞。体上部呈淡蓝色或橄榄色,腹部银白色,体侧分布有黑色或深褐色斑点,当其体重超过2500克以后,斑点逐渐消失。口亚下位,有触须4对,口角须最长,超过胸鳍基部,颐须和鼻须较短。 |
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