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【单选题】
Cuttlefish are intriguing little animals. The cut tlefish resembles a rather large squid and is, like the octopus, a member of the order of cephalopods. Although they are not considered the most highly evolved of the cephalopods, they are extremely intelligent. While observing them, it is hard to tell who is doing the observing, you or the cuttlefish, especially since the eye of the cuttlefish is similar in structure to the human eye. Cuttlefish are also highly mobile and fast creatures. They come equipped with a small jet located just below the tentacles that can expel water to help them move. Ribbons of flexible fins on each side of the body allow cuttlefish to hover, move, stop, and start. _____________________________________. The cuttlefish is sometimes referred to as the “chameleon of the sea” because it can change its skin color and pattern instantaneously. Masters of camouflage, they can blend into any environ ment for protection, but they are also capable of the most imaginative displays of iridescent, bril liant color and intricate designs, which scientists believe they use for communication and for mat ing displays. However, judging from the riot of ornaments and hues cuttlefish produce, it is hard not to believe they paint themselves so beautifully just for the sheer joy of it. At the very least, cut tlefish conversation must be the most sparkling in all the sea.Which of the following is correct according to the information given in the passage? a. Cuttlefish are a type of squid. b. Cuttlefish use jet propulsion as one form of locomotion. c. The cuttlefish does not have an exoskeleton. d. Cuttlefish are the most intelligent cephalopods.
A.
Cuttlefish are a type of squid.
B.
Cuttlefish use jet propulsion as one form of locomotion.
C.
The cuttlefish does not have an exoskeleton.
D.
Cuttlefish are the most intelligent cephalopods.
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【单选题】下列化合物中哪个是丁酸的同分异构体,但不属同系物
A.
丁酰溴
B.
丙酰胺
C.
甲酸丙酯
D.
丁酰胺
【简答题】焊条是由 和 组成的,在焊条前端药皮有45度左右倒角是为了方便 。在焊条尾部有一段裸露的焊芯,长约为 ,作用是 。
【多选题】选出可以用通报来行文的选项
A.
x县纪委拟批评xx局领导干部用国家钱财游山玩水的错误
B.
x区政府拟公布加强廉政建设的几条规定
C.
x市水电局将召开水利建设工作会议,需告知各区县水电部门事先做好准备
D.
x厂拟宣传本厂职工奋不顾身救落水儿童的先进事迹
【单选题】当一方向另一方提出索赔要求,被索赔方应采取适当的反驳、应对和防范措施,这称为( )。
A.
索赔
B.
反索赔
C.
逆索赔
D.
被动索赔
【单选题】当一方向另一方提出索赔要求,被索赔方应采取适当的反驳、应对和防范措施,这称为( )。
A.
反索赔
B.
索赔
C.
索赔和反索赔
D.
以上都不对
【单选题】某出料容量0.5m3的混凝士搅拌机,每一次循环中,装料、搅拌、卸料、中断需要的时间分别为1、3、1、1min,机械利用系数为0.8则该搅拌机的台班产量定额是( )m3/台班。
A.
32
B.
36
C.
40
D.
60
【单选题】当一方向另一方提出索赔要求,被索赔方所采取的反驳、应对和防范措施被称为( )。
A.
对索赔的反驳
B.
对索赔的防范
C.
对索赔的应对
D.
反索赔
【单选题】焊条前端角度为
A.
45°
B.
30°
C.
50°
D.
60°
【单选题】X市水电局将召开水利建设工作会议,需告知各县、区水电部门事先作好准备。可以用通报表达吗?
A.
可以
B.
不可以
【简答题】遗传学研究时选择的生物一般选择生活周期()、繁殖系数()体型()、染色体()且数目()的生物。
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