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【单选题】
1H-NMR 中,推断黄酮类化合物类型主要是依据( )A.
B环 H-3 ’的特征
B.
C 环质子的特征
C.
A 环 H-5 的特征
D.
A环 H-7 的特征
E.
B 环 H-4 ’的特征
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举一反三
【单选题】COLREG NO.10 apply to .
A.
vessels sailing in good visibility
B.
vessels sailing in separation schemes
C.
vessels sailing in reduced visibility
D.
vessels sailing in any condition of visibility
【单选题】[5-39]COLREG No.10 apply to ___国际海上避碰规则第十条适用于分道通航制航行的船舶。
A.
vessels sailing in any condition of visibility任何能见度中航行的船舶
B.
vessels sailing in reduced visibility能见度不良中航行的船舶
C.
vessels sailing in good visibility能见度良好中航行的船舶
D.
vessels sailing in separation schemes分道通航制航行的船舶
【单选题】[5-42]COLREG No.10 apply to ___
A.
vessels sailing in any condition of visibility
B.
vessels sailing in reduced visibility
C.
vessels sailing in good visibility
D.
vessels sailing in separation schemes
【简答题】咸的作用和适应症是什么?
【单选题】COLREG NO.10 apply to ___
A.
vessels sailing in any condition of visibility
B.
vessels sailing in reduced visibility
C.
vessels sailing in good visibility
D.
vessels sailing in separation schemes
【单选题】要去掉列表项前面默认的符号,需要设置:
A.
list-style-image:none;
B.
list-style-type:none;
C.
list-style-position:none;
D.
list-style-type:disc;
【简答题】在书写样式表的时候,一般在样式表的开始都需要设置默认样式清除效果, *{ ________:0; /*设置外边距为0*/ ________:none; /*去掉项目列表前面的符号*/ }
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