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【单选题】
一氧化碳中毒抑制 ( )的活性A.
细胞色素氧化酶
B.
酪氨酸酶
C.
胆碱酯酶
D.
巯基酶
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皮皮学刷刷变学霸
举一反三
【单选题】 矩形花键按装配型式分为固定联接、紧滑动联接和滑动联接三种 ,如果 内、外花键之间要求有相对移动,而且移动距离长、移动频率高的情况,应选用配合间隙较大的( )联接 。
A.
固定
B.
紧滑动
C.
滑动
【单选题】Scientists are interested in the eyes of frogs because______.
A.
frogs' eyes are large and threatening
B.
frogs' eyes are extremely sharp
C.
frogs have compound eyes
D.
frogs can only see moving objects
【简答题】It is bad for your eyes to read in the sun. ______ the sun is bad for your eyes.
【简答题】A．Feeling painful in eyes. B．Not being able to open the eyes. C．Getting dry eyes. D．Blinking more than usual.
【单选题】Will was lying on the grass, _______the sky thick with stars.
A.
his eyes fixing on
B.
fixed his eyes on
C.
his eyes were fixed on
D.
his eyes fixed on
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