磨蚀作用

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磨蚀作用

考点:地球科学概论地球科学概论题库
题型:名词解释

一条船顺流航行,每小时行20千米;逆流航行每小时行16千米。那么这条轮船在静水中每小时行(     )千米。

题型:名词解释

如果关于x的一元二次方程k2x2-(2k+1)x+1=0有两个不相等的实数根,那么k的取值范围是______.

题型:名词解释

下面关于网络系统设计原则的说法中,正确的是 ( ) 。

A.网络设备应该尽量采用先进的网络设备,获得最高的网络性能

B.网络总体设计过程中,只需要考虑近期目标即可,不需要考虑扩展性

C.网络系统应采用开放标准和技术

D.网络需求分析独立于应用系统的需求分析

题型:名词解释

I was a single parent of four small children, working at a low paid job. Money was always tight, but we had a (1) over our heads, food on the table, clothes on our backs, and if not a lot, always (2) . Not knowing we were poor, my kids just thought I was (3) . I’ve always been glad about that.

It was Christmas time, and although there wasn’t (4) for a lot of gifts, we planned to celebrate with a family party. But the big (5) for the kids was the fun of Christmas (6) .

They planned weeks ahead of time, asking (7) what they wanted for Christmas. Fortunately, I had saved MYM120 for (8) to share by all five of us.

The big (9) arrived. I gave each kid a twenty-dollar bill and (10) them to look for gifts of about four dollars each. Then everyone scattered. We had two hours to shop; then we would (11) back at the "Santa’s Workshop".

Driving home, everyone was in high Christmas spirits, (12) my younger daughter, Ginger, who was unusually (13) . She had only one small, flat bag with a few candies—fiftycent candies! I was so angry, but I didn’t say anything (14) we got home. I called her into my bedroom and closed the door, (15) to be angry again. This is what she told me.

"I was looking (16) thinking of what to buy, and I (17) to read the little cards on the ’Giving Trees’. One was for a little girl, four years old, and all she (18) for Christmas was a doll. So I took the card off the tree and (19) the doll for her. We have so much and she doesn’t have anything. "

I never felt so (20) as I did that day.

10()

A.forced 

B.reminded 

C.invited 

D.begged

题型:名词解释

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