皮皮学，免费搜题
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搜题
【单选题】
四冲程发动机曲轴，当其转速为3000r/min时，则同一气缸的进气门，在1min时间内开闭次数应该是（）A.
3000r/min
B.
1500r/min
C.
750r/min
D.
6000r/min
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参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
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【简答题】Say what you want—strong 明确表示自己所需
【简答题】在课文中找到相应的英文翻译: 公寓大楼
【多选题】What Should You Buy?
A.
Food looks good if you cut it into small pieces.
B.
Obento boxes are lunch boxes used in Japan.
C.
Mothers make obento boxes for nursery school children.
D.
You'll need to buy a box and things to separate it into sections.
E.
Get some colored napkins, ribbons, and chopsticks.
F.
Use different colors and textures to make an attractive box.
G.
It's important to decorate the box with things from nature.
H.
There are many books you can buy with good ideas.
I.
A divided box is packed with small portions of several foods.
【多选题】What Is an Obento Box?
A.
Food looks good if you cut it into small pieces.
B.
Obento boxes are lunch boxes used in Japan.
C.
Mothers make obento boxes for nursery school children.
D.
You'll need to buy a box and things to separate it into sections.
E.
Get some colored napkins, ribbons, and chopsticks.
F.
Use different colors and textures to make an attractive box.
G.
It's important to decorate the box with things from nature.
H.
There are many books you can buy with good ideas.
I.
A divided box is packed with small portions of several foods.
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