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【简答题】
在色环电阻的色环顺序表中,代表“ 5 ” 读数的颜色是 色。
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皮皮学刷刷变学霸
举一反三
【单选题】( )9. Zhao Lin _____ to Beijing by train often . He usually goes by plane.
A.
isn’t going
B.
doesn’t go
C.
not go
D.
don't go
【简答题】热电偶输出的________，是从零逐渐上升的，达到相应的温度后，则不再上升而呈现一个平台值。
【单选题】Zhao Lin _____ to Beijing by train often . He usually goes by plane.
A.
doesn’t go
B.
isn’t going
C.
not go
D.
don’t go
【单选题】Zhao Lin _____ to Beijing by train often. He usually goes by plane.
A.
don’t go
B.
not go
C.
doesn’t go
【简答题】广义的商品采购除了购买以外还包括 、 、交换三种途径。
【单选题】Zhao Lin _____ to Beijing by train often . He usually goes by plane.
A.
isn’t going
B.
doesn’t go
C.
not go
D.
don’t go
【单选题】According to Zhao Lin, what’s the symptom of the disease?
A.
Some part of the roots have turned brown, and then purple.
B.
Some part of the roots have turned purple, and then brown.
C.
Some part of the leaves have turned brown, and then purple.
D.
Some part of the leaves have turned purple, and then brown.
【单选题】双缩脲反应鉴别盐酸麻黄碱的原理为( )
A.
盐酸麻黄碱分子结构中含有的氨基醇侧链
B.
盐酸麻黄碱分子结构中所含羟基和铜离子形成有色化合物
C.
麻黄碱的碱性使铜离子形成碱式铜盐有色物
D.
麻黄碱分子与铜离子形成有色化合物
E.
铜离子氧化麻黄碱呈色
【单选题】Zhao Lin _____ to Beijing by train often . He usually goes by plane.
A.
isn’t going
B.
doesn’t go
C.
don’t go
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