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【判断题】
在一道工序中，工件在机床加工位置上只能装夹一次。A.
正确
B.
错误
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】What's the main idea of the passage?
A.
Bird wings are more complex than airplane wings.
B.
People design airplane by looking at the wing shapes of birds.
C.
How can we make the airplane wings more efficient.
D.
The wings of birds and airplanes conform. to the same aerodynamic principles.
【简答题】（ ）可以根据市场风险状况改变执行大户报告的持仓界限。
【单选题】Mr. Smith asked the man _____________ it again. [ ]
A.
not do
B.
didn't do
C.
not to do
【简答题】f____________ to move (the wings) quickly and lightly up and down
【单选题】Most birds ________ their wings up and down, but humming birds move their wings in a figure-eight pattern.
A.
flap
B.
flip
C.
swipe
D.
flutter
【单选题】碘量法测定维生素C含量时，若维生素C的分子量为176.13，每1ml碘滴定液（0.1mol/L）相当于维生素C的量为（ ）。
A.
4.403mg
B.
8.806mg
C.
17.61mg
D.
88.06mg
E.
1.761mg
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