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【单选题】
凸轮轴上凸轮的轮廓形状决定于()。A.
气门的形状
B.
气门的运动规律
C.
气门的密封状况
D.
气门的磨损规律
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【简答题】病害三角包括()、寄主、(病原)
【简答题】大约距今 万年左右,人类体质形态的原始特征基本消失, 开始形成,并且因所处地域的影响逐渐分化成 人种。
【单选题】关于“亚健康”，下列说法正确的是（）
A.
“亚健康”是健康与疾病之间的中间状态，又称第三状态
B.
“亚健康”多无临床症状或症状轻微，检查结果又达不到诊断标准，主要有心理、情感和躯体自感不适的体验
C.
以上都正确
【单选题】After the meeting, she invited us to dinner at her home and treated us _____ many exotic foods we _____ before. It was really a wonderful treat.
A.
with; had never tasted
B.
to; have never tasted
C.
with; have never tasted
D.
to; had never tasted
【单选题】A: Have you invited Susan to the party?B: ______
A.
Yes, because I know she wants to stay at home.
B.
Not yet, because I know she prefers to stay at home.
C.
No, because I know she likes to join us.
D.
Yes, because I've to think about it carefully.
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