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【简答题】
Healthy eating A r e you a typical teenager with parents who always go on and on about what you eat, when you eat or don’t eat and the amount of junk food you consume? Well, your parents are just doing their job. They want you to eat properly so you’ll develop and be hea l thy. Your body needs certain nutrients to feel well as you go through each day. The most important meal is breakfast, even though it’s probably the most difficult for many teenagers. Breakfast is even more important if you aren’t eating lunch on a regular basis, and are waiting until after school or until diner to eat. Your body needs a daily supply of protein, carbohydrates and healthy fats to be able to give you energy and keep you healthy. Protein foods include eggs, cheese, soy products, fish, beans nuts, seeds, chicken, turkey beef and pork. Carbohydrate foods include fruits. Vegetables, whole grains, and beans. You should eat too much food that contains sugar. It can have a negative effect on your blood sugar levels and your moods as well. Fats transport vitamins through your body and fatty tissue protects your vital organs from trauma and temperature change.
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参考答案:
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【判断题】HXN5机车,当进气温度升高,从燃油效率方面考虑是有效的,但对排放不利
A.
正确
B.
错误
【单选题】一对正常齿标准直齿圆柱齿轮传动,m=4mm,z 1 =22,z 2 =80,标准中心距a为()。
A.
408mm
B.
204mm
C.
102mm
【单选题】真果的果皮由( )发育而来。
A.
胚珠
B.
珠心
C.
珠被
D.
子房壁
【单选题】一对正常齿标准直齿圆柱齿轮传动,m=4mm, z1=22, z2=80,标准中心距a为 ( )
A.
408mm
B.
204mm
C.
102mm
D.
306mm
【简答题】【计算题】已知一标准正常齿制直齿圆柱齿轮传动,主动轮的齿数 Z 1 =20 ,从动轮齿数 Z 2 =85, 模数 m=4mm , 1 , 0.25 。试计算小齿轮的齿根高、齿顶高、齿全高、齿距、分度圆直径、齿顶圆直径、齿根圆直径及标准中心距。
【判断题】交织技术主要是将随机错误转化为突发错误,以便充分发挥纠错码的作用
A.
正确
B.
错误
【单选题】一对正常齿标准直齿圆柱齿轮传动,m=4mm,z 1 =22,z 2 =80,标准中心距a为()mm。
A.
408
B.
204
C.
102
D.
306
【单选题】一对正常齿标准直齿圆柱齿轮传动, m=4 mm , z1=22 , z2=80 ,标准中心距 a 为多少?
A.
408 mm
B.
204 mm
C.
102 mm
D.
306 mm
【单选题】一对正常齿标准直齿圆柱齿轮传动,m=4mm, z1=22, z2=80,标准中心距a为 ( )。
A.
 408mm
B.
 204mm
C.
 102mm
D.
 306mm
【判断题】9HXN5机车,当进气温度升高,从燃油效率方面考虑是有效的,但对排放不利
A.
正确
B.
错误
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