皮皮学,免费搜题
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【简答题】
It was Saturday yesterday. I had no lessons. I got up at six. After breakfast,I went to a farm by truck(卡车) with my classmates to help the farmers with apple harvest(收获). As soon as we went there, we began to pick apples. But some of the apples are too high for me to reach. Jim is very strong. He lifted(举) a ladder(梯子) and held(扶) it for me. So I was able to pick them. Some of us took the baskets of apples to the truck and some put the baskets of apples onto the truck. It was hard work, but we all felt very happy. When did you go? 1 Where did you go? 2 Who went there ? My classmates and I How did you get there? 3 What did you do there? 4 How did you feel about it? 5
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皮皮学刷刷变学霸
举一反三
【单选题】已知向量a=(2,-4),b=(1,2),c=(1,-2),d=(-2,-4),则其中共线的有( )
A.
a与d共线,b与c共线
B.
a与b共线,c与d共线
C.
a与c共线,b与d共线
D.
以上答案都不正确
【多选题】与传统医学材料相比,金属基医用复合材料具有的优点有()
A.
力学强度高
B.
柔韧性优良
C.
耐疲劳性能好
D.
成型工艺优异
【单选题】下列命题中正确的有(  ) ①若向量a与b满足a?b<0,则a与b所成角为钝角; ②若向量a与b不共线,m=λ 1 ?a+λ 2 ?b,n=μ 1 ?a+μ 2 ?b,(λ 1 ,λ 2 μ 1 ,μ 2 ∈R),则m ∥ n的充要条件是λ 1 ?μ 2 -λ 2 ?μ 1 =0; ③若 O A + OB + O C =0 ,且 | O A |=| OB |=| O C | ,则△ABC是等边三角...
A.
②③④
B.
①②③
C.
①④
D.
【判断题】一般来说,复合材料具有高的比强度、比刚度和良好的抗疲劳性能。
A.
正确
B.
错误
【简答题】My parents are ― Excuse me, I'm stuck for a proper word — liberal-minded. They know they ______ telling me what to do in everything.
【判断题】碳纤维增强银基复合材料的性能具有良好的尺寸稳定性和高温力学性能
A.
正确
B.
错误
【单选题】My parents are ______ with my progress.
A.
please
B.
pleased
C.
pleasing
D.
being pleased
【单选题】下列关于食物中毒的说法中表述错误的选项是()
A.
潜伏期短
B.
具有传染性
C.
发病呈爆发性
D.
发病与食物有关
【单选题】下列关于食物中毒的说法中表述错误的选项是()。
A.
发病与食物有关
B.
发病呈爆发性
C.
潜伏期短
D.
具有传染性
【多选题】根据连续纤维增强原理,哪些措施可以保证复合材料具有优异的性能?
A.
优异的纤维性能
B.
足够的纤维体积分数
C.
与整体结构配合的纤维排列
D.
良好的界面结合
E.
基体具有良好的塑性
F.
基体性能均匀
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