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【简答题】
中国居民膳食指南包括 食物多样, ( ) 为主,粗细搭配 ; 多吃 ( ) 水果和薯类 ; 每天吃 ( ) 、大豆或其制品 ; 常吃适量的鱼、禽、蛋和 ( ); 减少烹调 ( ) 用量,吃清淡少 ( ) 膳食 ; 食不过量,天天运动,保持健康体重 ;( ) 分配要合理,零食要适当 ; 每天足量 ( ) ,合理选择饮料 ; 如饮酒应限量 ; 吃新鲜卫生的食物 。
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【简答题】Last year, a report by a committee of education experts said that a lot of American students cannot write well. The report noted the concerns of business leaders and teachers. The experts said that mo...
【单选题】It’s a mistake to think of Florida only __ its tourist attractions. A. by means of B. in terms of C. in connection with D. by way of
A.
by means of
B.
in terms of
C.
in connection with
D.
by way of
【单选题】a fire, hotel guests are askedto remain calm. A) In the event of B) In the time of C) As a result of D) By reason of
A.
In the event of
B.
In the time of
C.
As a result of
D.
By reason of
【单选题】一对作减速传动的标准渐开线直齿圆柱齿轮,小齿轮为1齿轮,大齿轮为2齿轮,材料、热处理及齿面硬度均相同,则正常条件下传动时,两齿轮间产生的接触应力和弯曲应力关系为 _______ 。
A.
σ H1 >σ H2 σ F1 =σ F2
B.
σ H1 H2   σ F1 =σ F2
C.
σ H1 =σ H2 σ F1 F2
D.
σ H1 =σ H2 σ F1 >σ F2
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A.
σH1>σH2 σF1=σF2
B.
σH1
C.
σH1=σH2 σF1
D.
σH1=σH2 σF1>σF2
【单选题】下列何项与肝郁化火失眠无关:( )
A.
烦躁失眠
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面红目赤
C.
心悸健忘
D.
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A.
quality and price
B.
usefulness and durability
C.
need satisfying capability
D.
appearance and inner packing
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A.
12
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C.
9
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8
E.
6
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【简答题】齿轮传动时,两轮轮齿的齿面接触应力σH 相等 ,而两轮轮齿的齿根弯曲应力σF 。
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