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【简答题】
轮系是指：（）；周转轮系是指：轮系运动时，凡至少有一个齿轮的轴线是绕另一齿轮的轴线转动的轮系。
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反馈参考答案：
举一反三
【单选题】—Little Jim has been eating sweets all day. —It’s no ________ he is not hungry
A.
matter
B.
doubt
C.
problem
D.
wonder
【简答题】...since the child is neither old enough nor clever enough to realize the desired action on his own, what possible gain is achieved by having him struggle?
【单选题】The child is _______ clever that she won't ______ your trick.
A.
so ; fall into
B.
so ; fall for
C.
such ; fall over
D.
such ; fall into
【简答题】... since the child is neither old enough nor clever enough to realize the desired action on his own, what possible gain is achieved by having him struggle?
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