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【单选题】
在原子吸收光谱法中的基体效应不能用下述( )消除。A.
标准加入法
B.
稀释法
C.
配置与待测试样组成相似的标准溶液
D.
扣除背景
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
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举一反三
【简答题】已知函数f（x）=x 2 + +alnx（x＞0）， （Ⅰ）若f（x）在[1，+∞)上单调递增，求a的取值范围； （Ⅱ）若定义在区间D上的函数y=f（x）对于区间D上的任意两个值x 1 、x 2 总有以下不等式 成立，则称函数y=f（x）为区间D上的“下凸函数”。试证当a≤0时，f（x）为“下凸函数”。
【简答题】Returning from his phone calls to find his patient not breathing, Jason told the police he had tried to ____ him and one of his staff had called for an ambulance. (arrogant, coma, haggard, resuscitate...
【简答题】Andy was still traveling in Spain when he realized he had to confirm his flight home with the airline company. He was visiting Spain in order to improve his Spanish. When he was speaking to people fac...
【简答题】定义在R上的函数，对任意x 1 ，x 2 ∈R，都有 f( x 1 + x 2 2 )≥ 1 2 [f( x 1 )+f( x 2 )] ，则称函数f（x）是R上的凸函数．已知二次函数f（x）=ax 2 +x（a∈R，a≠0）． （1）求证：当a＜0时，函数f（x）是凸函数； （2）对任意x∈（0，1]，f（x）≥-1恒成立，求实数a的取值范围．
【单选题】明代杰出的书画家唐伯虎曾为一家新开张的商号挥笔写下:“生意如春草,财源似水泉”,此字贴在店前后,见者无不称赞,观联购物者络绎不绝。这反映了当时的哪一种广告形式?
A.
对联广告
B.
悬物广告
C.
实物 广告
D.
招牌广告
【单选题】The news that he had survived the cut thrilled him so much that he rushed to the nearest phone and called his father.
A.
extremely encouraged
B.
extremely excited
【简答题】Andy was still traveling in Spain when he realized he had to confirm(确认)his flight(航班)home with the airline company.He was visiting Spain in order to 1 his Spanish.When he was speaking to people 2 he ...
【简答题】函数f(x)在区间(a，b)上称为下凸(上凸)的，如果对此区间中的任意两点x 1 及x 2 以及任意数λ 1 及λ 2 (λ 1 ＞0; λ 2 ＞0;λ 1 +λ 2 =1)有不等式 f(λ 1 x 1 +λ 2 x 2 )＜λ 1 (x 1 )+λ 2 f(x 2 )或有相反的不等式 f(λ 1 x 1 +λ 2 x 2 )＞λ 1 f(x 1 )+λ 2 f(x 2 ) 求证：1)若a＜x＜...
【简答题】明代杰出的书画家唐伯虎曾为一家新开张的商号挥笔写下：“生意如春草，财源似水泉” 此字贴在店前后，见者无不称赞，观联购物者络绎不绝。这反映了当时的（）广告形式。
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