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【单选题】
最简单的行星齿轮机构是由（）组成的，称为一个行星排。A.
一个太阳轮、一个齿圈、一个行星架和支承在行星架上的几个行星齿轮
B.
一个太阳、一个齿圈和几个行星齿轮
C.
一个太阳轮、一个行星架和支承在行星架上的几个行星齿轮
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皮皮学刷刷变学霸
举一反三
【单选题】My coat is too small, so I’m _________.
A.
going fishing
B.
going swimming
C.
going shopping D going camping
【单选题】-- You are not going out today, are you? --_______ I want to go shopping.
A.
Yes, I'm
B.
No, I'm not
C.
Yes, I am
D.
No, I am
【简答题】根据对话内容排列顺序。 Amy: What are you going to do this weekend? Sarah: I'm going to go shopping on Saturday morning. Amy: And then? Sarah: In the afternoon, I'm going to visit my grandparents. And in the even...
【单选题】在刚体上作用3个大小相等的力,其力三角形如图所示,则该力系的简化结果 。
A.
必为一个力
B.
必为 一个力和一个力偶
C.
必为一个力偶
D.
可能平衡或简化为一力偶
【单选题】选择填空。 I'm with my mother. [ ]
A.
do shopping
B.
go to shopping
C.
go shopping
D.
going shopping
【简答题】—Would you like to go shopping with me tonight? ---I’d like to , but there is going to be a(n)_____basketball match. A live B aliv e C lively D living
相关题目：
【单选题】选择填空。 I'm with my mother. [ ]
A.
do shopping
B.
go to shopping
C.
go shopping
D.
going shopping