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When many people from other countries come to America for the first time, they meet many difficulties. They can't speak much English, and they don't know much 56 America. Sometimes, they make mistakes. Sally 57 to America from Korea years ago. Because her English wasn' t good, she was afraid to ask the ways. So she usually 58 find the places in America. Then she hoped she could see something that she knew, 59 she couldn' t. Then she began to cry and miss her own country because she 60 had this kind of problems in Korea. She could find the places easily in 61 . Little Henry came to America from Thailand with his parents. He didn' t know 62 to put the money into an American bank at first. When he grew 63 and knew more English, he finally put the money into an American bank successfully (成功地). There 64 many other things about America, and the people from other 65 can' t understand those things when they come to America for the first time. They need to learn more. 小题1:A. at                     B. about                    C. for 小题2:A. wrote                  B. talked                   C. came 小题3:A. can                   B. could                   C. couldn't 小题4:A. but                    B. or                       C. so 小题5:A. usually                B. never                   C. always 小题6:A. America               B. Korea                    C. Thailand 小题7:A. how                 B. what                      C. where 小题8:A. thinner               B. older                     C. heavier 小题9:A. is                   B. was                      C. are 小题10:A. countries             B. families                    C. banks
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【多选题】图示全直动十字滑块机构,试判断下列关于此机构的自由度F计算分析哪些是正确的( )
A.
此机构为平面全移动副机构,公共约束m =4,故F = 2n – pl = 2×3 – 1×4 =2
B.
此机构为平面全低副机构,十字滑块连接带入1个虚约束,故F = 3n –(2pl – p ') = 3×3 –(2×4 –1)= 2
C.
此机构为平面全移动副机构,十字滑块带入1个虚约束,故F = 2n –(pl – p ') = 2×3 –(4 –1)= 2。
D.
此机构为平面全低副机构,F = 3n – 2pl = 3×3 – 2×4 = 1
【简答题】写出此机构的活动构件数、低副数目、高副数目,并计算此机构的自由度
【简答题】(1)图中是冰的熔化实验,这是通过_______________的途径改变物体的内能。右图为冰由固态变为液态过程中温度随时间变化的图象,其中t 2 时刻物体的内能_________(选填“等于”或“不等于”)零,t 2 时刻物体的内能_______ t 3 时刻的内能(选填“大于”、“等于”或“小于”)。 (2)如图,活塞迅速下压过程,通过___________途径使管内空气的内能增加,温度升高,...
【多选题】藿香正气散的组成有()
A.
藿香、白芷、紫苏
B.
半夏、陈皮、甘草
C.
苍术、茯苓、桔梗
D.
厚朴、大腹皮
E.
白术、桔梗、茯苓
【单选题】将50个数据分成3组,其中第1组与第3组的频数之和为35,则第2组的频数是( )
A.
0.3
B.
30
C.
15
D.
35
【单选题】图1-7-3为气温随高度的变化,试判断大气层结为不稳定的是 。
A.
B.
C.
D.
A 、 B 、 C 均错
【单选题】当一个平面机构的原动件数目小于此机构的自由度数时,此机构( )。
A.
具有确定的相对运动
B.
只能作有限的相对运动
C.
运动不能确定
D.
不能运动
【单选题】霍兰德职业类型论中没有以下哪种类型代码?
A.
R
B.
D
C.
C
D.
E
【单选题】为了便于开启,门扇的宽度通常在1000mm以内。门的宽度不超过()mm时,一般采用单扇门。
A.
800
B.
900
C.
1000
D.
1200
【单选题】下列有关中国现行土地使用制的认识,正确的是
A.
农民集体所有的土地只能由本集体经济组织成员承包经营
B.
土地承包经营权权能完整,包含土地发展权
C.
农户宅基地可无偿无限期使用,且可以自由流转
D.
城镇国有土地使用权出让的方式包括协议、招标、拍卖、挂牌四种方式
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