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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】氯苯中-Cl与苯环间存在的电子效应有( ),乙酰氯中-Cl与羰基间存在的电子效应有( ) a 诱导效应 b 共轭效应
A.
a、b
B.
b、a
【判断题】建设工程实行施工总承包的,由总承包对施工现场的安全生产负总责,总承包单位应自行建设工程的主体工程的施工,总包单位对分包单位的安全承担连带责任,分包出现安全事故承担主要责任。()
A.
正确
B.
错误
【判断题】分离变量法是求解电位所满足的泊松方程的一个重要方法。
A.
正确
B.
错误
【判断题】若数列 是一发散数列,则其子数列必定发散
A.
正确
B.
错误
【单选题】潜血试验膳食可选用的食物是?
A.
豆腐
B.
牛肉
C.
羊肝
D.
油白菜
E.
炒血块
【判断题】建设工程实行施工总承包的,由总承包单位对施工现场的安全总负责。()
A.
正确
B.
错误
【单选题】0表达式1/2的结果是( )。
A.
0.5
B.
1
C.
0
D.
以上都不对
【单选题】氯苯中-Cl与苯环间存在的电子效应有( ),乙酰氯中-Cl与羰基间存在的电子效应有( ) a 诱导效应 b 共轭效应
A.
a、b ; a、b
B.
b ; a
【判断题】分离变量法是求解电位所满足的泊松方程的一个重要方法。
A.
正确
B.
错误
【多选题】关系运算符是用于关系的判断,其组成的表达式叫关系表达式。其结果只有满足和不满足两种结果。 在C语言中,将满足用1来表示,用0来表示不满足。以下表达式结果为1的表达式有( )
A.
58<60
B.
'Y'
C.
(2020%4)==0
D.
-45<0
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