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【单选题】
下列说法错误的是（ ）。A.
齿轮载荷分布是否均匀，与齿面啮合的接触状态有关
B.
螺旋线总偏差△Fβ是评定齿轮载荷分布均匀性精度时的强制性检测精度指标
C.
齿廓总偏差△Fα直接反映了齿轮工作齿面的瞬时接触情况，影响齿轮的传动平稳性
D.
单个齿距偏差△fpt是评定齿轮载荷分布性精度时的强制性检测精度指标。
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皮皮学刷刷变学霸
举一反三
【单选题】Task 3 Most animals only have animals of a different kind for food. But sometimes two kinds of animals come together in a partnership ( 伙伴关系 ) which is good forthem. You may have noticed some birds on...
A.
they can eat its parasites
B.
they enjoy traveling with the sheep
C.
they can’t live without its parasites
D.
they want to find the warm place
【单选题】Task 2 Most animals only have animals of a different kind for food. But sometimes two kinds of animals come together in a partnership ( 伙伴关系 ) which is good forthem. You may have noticed some birds on...
A.
they can eat its parasites
B.
they enjoy traveling with the sheep
C.
they can’t live without its parasites
D.
they want to find the warm place
【单选题】Task 16 Most animals only have animals of a different kind for food. But sometimes two kinds of animals come together in a partnership ( 伙伴关系 ) which is good forthem. You may have noticed some birds o...
A.
they can eat its parasites
B.
they enjoy traveling with the sheep
C.
they can’t live without its parasites
D.
they want to find the warm place
【简答题】This is a sheep.
【简答题】Read and choose. 找朋友。 ( )1. What's this? ( )2. Is this a sheep? ( )3. What colour is it? ( )4. Is this a cat? ( )5. Happy birthday! A. It's red. B. Yes, it is. C. It's a sheep. D. ...
【简答题】大资产阶级是中国民主革命的主要对象之一，因此，它始终是被排除在统一战线之外的。
【单选题】—Is this a goat? —No. It's a ______ . They're _____.
A.
goat; the same
B.
goat; different
C.
sheep; different
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