问题
单项选择题
WK-20型挖掘机正滑板使用的材质是（）。
A.尼龙
B.铁
C.锰钢
D.铸铁
答案
参考答案：D
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WK-20型挖掘机正滑板使用的材质是（）。
A.尼龙
B.铁
C.锰钢
D.铸铁
参考答案：D
One day, a teacher was speaking to a group of students about how to manage time. He gave such an interesting example that his students would never 1 . He put a wide-mouth jar (罐子) on the table. Then he 2 some rocks and carefully placed them into the jar, one at a time. When 3 rocks would fit inside, he 4 , “Is this jar full?” Everyone in class shouted, “Yes.” “Really?” The teacher pulled out a bag of small stones. He put 5 small stones in and shook the jar. The small stones went 6 into the spaces between the big rocks. He then asked the group 7 , “Is this jar full?” “Probably not,” one of them answered. “Good!” the teacher replied. He brought out a box of sand and 8 some sand into the jar and it went between the rocks and small stones. Again he asked the 9 question, “Is this jar full? “No,” the class shouted. Once more the teacher said, “Good.” He poured a cup of water into the jar 10 it was full. The he asked, “What is the point here?” One student 11 his hand and said, “The point is that if you try really hard, you can 12 put more things in.” “No,” the teacher replied, “that’s not the 13 . What I want to tell you is that if you don’t put the big rocks in first, you will never get others in at all. 14 are the ‘big rocks’ in your life? Time with your friends, your education or your dreams? Remember to put the 15 in first, or you’ll never get others in at all.?”
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