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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 best describes the pur pose of the author in the passage? a. to prove the intelligence of cuttlefish b. to explain the communication habits of cuttlefish c. to produce a fanciful description of the “chameleon of the sea” d. to describe the “chameleon of the sea” informatively and entertainingly
A.
to prove the intelligence of cuttlefish
B.
to explain the communication habits of cuttlefish
C.
to produce a fanciful description of the “chameleon of the sea”
D.
to describe the “chameleon of the sea” informatively and entertainingly
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举一反三
【单选题】多轴飞行器控制电机转速的直接设备为
A.
电源
B.
电调
C.
飞控
【判断题】移动支付就是允许用户使用其移动终端(通常是手机)对所消费的商品进行账务支付的一种服务方式。
A.
正确
B.
错误
【单选题】城市轨道交通的开通顺序为( )
A.
试运营、试运行、正式运营
B.
试运行、试运营、正式运营
C.
正式运营、试运行、试运营
D.
试运营、正式运营、试运行
【单选题】What will the student be likely to do after the conversation?
A.
He will pay the fine today.
B.
He will return the book after the exam.
C.
He will pay the fine after the exam.
D.
He will try to find people who put the book on hold.
【简答题】图 1 中,分布筋单根长为( ) A.1650mm B.1670mm C.1570mm D.1620mm 2. 图 1 中,高端平板上部纵筋在踏步段内的长度为( ) A.740mm B.375mm C.560mm D.480mm 3. 图 1 中,楼梯的 bs 长度为( ) A.1.5m B.0.74m C.200mm D.250mm 4. 图 1 中,楼梯的斜度系数 K 值为( ) A.1.28...
【单选题】多轴飞行器控制电机转速的直接设备为[1分]
A.
电源
B.
电调
C.
飞控
【单选题】如图所示,现浇板,保护层厚度取20mm,图中未注明的梁宽为300mm,轴线居中,分布筋间距为φ8@250,温度筋为φ8@200,②轴线上支座负筋的下料长度为()。(90°弯曲调整值扣除2d)【图片】
A.
2160
B.
2200
C.
2128
D.
2144
【单选题】多轴飞行器控制电机转速的直接设备为()
A.
电池
B.
电调
C.
螺旋桨
【单选题】多轴飞行器控制电机转速的直接设备为( )
A.
电源
B.
电调
C.
飞控
D.
电机
【多选题】文本教材的主要类别包括______。
A.
理论教材
B.
实务教材
C.
实验实习指导书
D.
参考教材
E.
练习册
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