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【简答题】
阅读理解。 Lily: Hello! This is Lily speaking. Is that Kate? Kate: Yes, it is. Hi! Lily! Lily: Hi! There's a meeting this afternoon in our classroom. Can you come, Kate? Kate: I'm afraid I can't. My mother isn't feeling well today. I must help her with the housework and look after my little brother. Lily: I'm sorry to hear that. But it doesn't matter. I think you'd better stay at home. Kate: Thank you. By the way, what's the meeting about? Lily: It's about the basketball game. We're going to play against (对抗) Class Three. Kate: That's great! Lily: I got a letter from Uncle Wu yesterday. And a color photo, too. Kate: Er... 1. Kate can't go to the meeting because _____. A. she isn't feeling well B. she has a lot of homework to do C. her mother isn't at home D. her mother is ill 2. The meeting is about _____. A. a color photo B. the football game C. Uncle Wu D. the basketball game 3. Uncle Wu is a _____. A. worker B. doctor C. farmer D. teacher 4. Kate and Lily went to the Jinxing Farm to help with _____. A. picking apples B. summer harvest C. growing vegetables D. autumn harvest 5. Which of the following is TRUE? A. The photo is black and white. B. Kate and Lily aren't in Class Three. C. Kate's little brother is ill. D. Uncle Wu is a bad man.
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【单选题】若平面力系由三个力组成(设这三个力互不平行),下述说法正确的是
A.
若力系向某点简化,主矩为零,则此三个力必然汇交于一点
B.
若主矢为零,则此三个力必然汇交于一点
C.
此力系绝不能简化为一个合力偶
D.
若三个力不汇交于一点,则此力系一定不平衡
【单选题】在一个红细胞内寄生多个环状体的现象常见于
A.
恶性疟原虫
B.
间日疟原虫
C.
三日疟原虫
D.
卵形疟原虫
【多选题】某平面力系由一平面平行力系与一平面汇交力系组成(汇交点为 A ),若其中的平面平行力系简化为一力偶,则有( )。
A.
若力系向A点简化,必有 M A ≠ 0 ;
B.
若力系向另一点简化,必有 M B ≠ 0 ;
C.
此力系可能是平衡力系;
D.
若汇交力系的合力不为零,则此力系最终的简化结果一定是一个力。
【判断题】发文字号由发文机关代字、发文年限和发文顺序号组成。
A.
正确
B.
错误
【单选题】某平面力系由三个力组成,设这个三个力互不平行则正确的有
A.
若力系向某点简化,主矩为零,则此三个力必然汇交于一点;
B.
若主矢为零,则此三个力必然汇交于一点;
C.
此力系绝不能简化为一合力偶;
D.
若三个力不汇交于一点,则此力系一定不平衡。
【单选题】在一个红细胞内寄生多个环状体的现象常见于
A.
恶性疟原虫
B.
间日疟原虫
C.
三日疟原虫
D.
卵形疟原虫
E.
三日疟原虫和恶性疟原虫
【判断题】发文字号由机关代字、序号和年份组成。()
A.
正确
B.
错误
【单选题】发文字号由( )组成。
A.
紧急程度和保密期限
B.
眉首、主体和版记
C.
主题词和成文日期
D.
发文机关代字、年份和序号
【单选题】某平面力系由三个力组成,设这三个力互不平行,下述结论正确的为( )。
A.
若力系向某点简化,主矩为零,则此三个力必汇交于一点
B.
若力系的主矢为零,则此三个力必汇交于一点
C.
若这三个力不汇交于一点,则此力系一定不平衡
D.
此力系绝不能简化为一合力偶
【判断题】发文字号由发文机关代字、发文年度和发文顺序号组成。
A.
正确
B.
错误
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