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【简答题】
图示曲柄滑道机构中,上有圆弧形滑槽,其半径R=10cm,圆心在上。曲柄长OA=10cm,以匀角速度ω=4πrad/s绕O轴转动。求当φ=30°时CB的速度及加速度。
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皮皮学刷刷变学霸
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【单选题】If the labor required per unit of output falls as output increases, this can be thought of as a situation __________.
A.
of constant returns to scale.
B.
of decreasing returns to scale.
C.
of increasing returns to scale.
D.
That is exactly the same situation as was the case in Ricardo's analysis.
【单选题】We require a minimum of 24 hours notice in advance to ensure we can provide a baby-sitter for your guest.
A.
我们要求至少提前24小时告知我们以保证我们能够为您的客人提供育婴师。
B.
我们需要一份最多提前24小时的通知以保证我们能够为您的客人提供育婴师。
C.
我们要求一份至少24小时的告知书以保证我们能为您的客人找到一位保姆。
D.
我们需要至少提前24小时告知客户来确保我们为您提供保姆。
【单选题】I wouldn’t mind______a roommate. We can help each other and save money as well.
A.
having
B.
to have
C.
have
D.
had
【简答题】Eat your vegetables. Wash your hands. Always say “please' and“thank you'. We are full of advice for our children, but when it comes to money, we often have little to say. As a result, our children may...
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