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【简答题】
曲柄连杆机构由 、 和 组 三部分组成。
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参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】光敏电阻的暗态前历一般比亮态前历的响应时间 。（长/短）
【单选题】Thousands of animal lives would be ______ daily if we just eat vegetables.
A.
spared
B.
freed
C.
escaped
D.
released
【单选题】We should eat a lot of fruit and vegetables ___________ . [ ]
A.
having good health
B.
to stay healthy
C.
keep in good health
D.
stay healthy
【简答题】设随机变量 ，则 的值为_____.
【单选题】Health is very important to us, We should eat more vegetables and fruit instead of _____ rich food. [ ]
A.
too much
B.
much too
C.
very much