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【简答题】
H-NMR中，与质子相连元素的 能力越强，质子的电子云密度大。
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反馈参考答案：
举一反三
【简答题】切换元素显示模式,需要设置CSS属性 。
【单选题】On hearing the news, he rushed out, and,_____ the dictionary lying open on the desk, _ into the distance．
A.
leaving; disappearing
B.
left; disappeared
C.
left; disappearing
D.
leaving; disappeared
【单选题】He was asked many times to join the Party, but he always kept his _____. [ ]
A.
way
B.
manner
C.
distance
D.
attitude
【单选题】He was a loyal, distinguished and very ( ) civil servant.
A.
competent
B.
lighter
C.
indent
D.
bunker
【简答题】He was accused of being _______ (loyal) to the government.
【单选题】葡萄糖中重金属的检查:样4.0g溶于23ml水,加入2ml缓冲盐,依法检查,其重金属不得超过 百万分之五,取标准铅( 10μg/ml),v=?
A.
1.0
B.
1.5
C.
2.0
D.
2.5
E.
3
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