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【多选题】
下图所示齿轮传动系统,四个齿轮均用花键与轴连接。Z1、Z2、Z3、Z4分别为各齿轮齿数,n1与n2分别为输入轴与输出轴的转速。请问图示状态下,输入与输出轴间的传动比是____。 下图所示齿轮传动系统,四个齿轮均用花键与轴连接。 Z 1 、 Z 2 、 Z 3 、 Z 4 分别为各齿轮齿数, n 1 与 n 2 分别为输入轴与输出轴的转速。请问图示状态下,输入与输出轴间的传动比是 ____ 。A.
(Z 3 *Z 1 )/(Z 2 *Z 4 )
B.
n 1 /n 2
C.
(Z 2 *Z 4 )/(Z 1 *Z 3 )
D.
n 2 /n 1
E.
(Z 2 *Z 3 )/(Z 1 *Z 4 )
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【单选题】Many doctors believe cures for many forms of cancer _____soon
A.
will discover
B.
will be discovered
C.
they will be discovered
D.
have been discovered
【简答题】1919年( )在《新青年》上发表《我的马克思主义观》一文，比较全面的介绍了马克思主义的唯物史观，经济学说和社会主义理论。
【单选题】_______there any carrots? I need some for the salad I’m .
A.
Are
B.
Is
C.
Isn’t
D.
Aren't
【简答题】翻译 Does Tom like carrots？ ？
【单选题】A standard Veggiematik machine can chop 36 carrots in 4 minutes. How many carrots can 6 standard Veggiematik machines chop in 6 minutes?
A.
36
B.
54
C.
108
D.
216
E.
324
【单选题】The residents of Vegopia spend all of their income on cauliflower, broccoli, and carrots. In 2010, they buy 100 heads of cauliflower for $200, 50 bunches of broccoli for $75, and 500 carrots for $50. ...
A.
Cauliflower Broccoli Carrots $2 $1.50 $0.10
B.
Cauliflower Broccoli Carrots $3 $1.50 $0.10
C.
Cauliflower Broccoli Carrots $3 $1.50 $0.20
D.
Cauliflower Broccoli Carrots $3 $1.20 $0.20
【单选题】WWhat can we learn about carrots, according to the passage?
A.
They can cure cancers of many kinds.
B.
Raw carrots have the same nutritional value as cooked ones.
C.
Cooked ones show no effect on cancers.
D.
Carrots can be very useful on a cancer prion diet.
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