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【单选题】
Elephants are the biggest animals that live on land (some whales are bigger than elephants but whales live in the sea), when born a baby elephant weighs 91 kilograms. That is the weight of a grown man. It is about 91 centimeters high. When it reaches the age of six years, it is about 183 centimeters high. (30) When it reaches the age of twelve years, it does not grow any more. It may then be 320 centimeters high. African elephants are bigger than Indian elephants. African elephants have much bigger ears. Elephants have very long noses which we call 'trunks'. No other animals have trunks as long as elephants. An elephant can use its trunk to smell things and it can also pick up things with the tip of its trunk. The tip of its trunk can be used like a hand. An elephant uses its trunk to feed itself. It likes to eat leaves, young juicy branches of a tree and fruit. It picks these with its trunk and puts the food into its mouth. When it wants a drink, it puts the tip of its trunk into water. It fills its trunk with water and then blows the water into the mouth. The elephant washes itself in the same way. It fills its trunk with water and then blows the water over itself. Two of the elephant's teeth are very long and strong. They are called 'tusks'. They use their tusks to dig up small trees and to dig in the ground for water. Elephants also use their tusks to lift heavy logs of wood. In some countries men catch wild elephants and teach them to work. After a while they are no longer wild. They become tame. They become very obedient. They do what their masters tell them to do. All day long they work patiently in the hot sun. They pull trees along and lift heavy logs. No animal is stronger than an elephant. Elephants have very strong legs. Their legs are like trees. They usually walk slowly because they are so big, but they walk very quietly. The biggest animals in the world live______.
A.
on land
B.
both on land and in the sea
C.
in the sea
D.
in the forests
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【单选题】耐折叠和弯曲疲劳性能优良,广泛用于制造塑料打包带的是( )
A.
聚丙烯
B.
聚苯乙烯
C.
聚碳酸酯
D.
聚氯乙烯
【单选题】用亚硫酸钠-硫酸反应鉴别苯巴比妥及其钠盐的原理为()。
A.
烯醇式的酸性反应
B.
丙二酰脲的水解反应
C.
可能为苯环上的硝基取代反应
D.
估计是苯环上的亚硝基取代反应
E.
丙二酰脲1,3位N上的缩合反应
【多选题】下面几组词中都是外来词的是( )
A.
马铃薯 啤酒
B.
香波 蜜月
C.
维他命  冰淇淋
D.
迷你 超市
E.
华尔兹  威士忌
【单选题】某船排水量6836t,在右舷距船中6m的压载舱注入42t压载水后,测得船舶横倾角为2.5°,则此时船舶GM=------m。
A.
1.25
B.
1.11
C.
0.85
D.
0.68
【单选题】用亚硝酸钠一硫酸反应鉴别苯巴比妥及其钠盐的原理为
A.
烯醇式的酸性反应
B.
丙二酰脲的水解反应
C.
可能为苯环上的硝基取代反应
D.
估计是苯环上的亚硝基取代反应
E.
丙二酰脲1,3位N上的缩合反应
【判断题】电动座椅是根据改变电动机中电流的方向来改变电动机的转动方向来实现的。
A.
正确
B.
错误
【单选题】用亚硝酸钠-硫酸反应鉴别苯巴比妥及其钠盐的原理为
A.
烯醇式的酸性反应
B.
丙二酰脲的水解反应
C.
可能为苯环上的硝基取代反应
D.
估计是苯环上的亚硝基取代反应
E.
丙二酰脲1,3位N上的缩合反应
【多选题】创业也是职业生涯规划过程中一种职业选择,在进行创业决策时,也同样遵循职业生涯的基本理论和模型,人职基本模型的关键环节包括(多选)
A.
设定发展方向
B.
确定发展策略
C.
制定行动计划
D.
评估和调整
【多选题】创业也是职业生涯规划过程中一种职业选择,在进行创业决策时,也同样遵循职业生涯规划的基本理论和模型,人职基本模型的关键环节包括( )
A.
设定发展方向
B.
确定发展策略
C.
制定行动计划
D.
评估和调整
【简答题】普通话单元音韵母可以分为()元音、舌尖元音和()元音三个小类。
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