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【多选题】
食品中有毒金属污染的毒性特征包括（ ）A.
多数情况下是以低剂量长期摄入以后，在体内可以产生较强的蓄积毒性
B.
半衰期较长，进入人体排出较缓慢
C.
可以通过食物链发生生物富集的效应
D.
在生物体内和人体内达到较高的浓度
E.
对人体危害通常是慢性危害为主
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举一反三
【简答题】有一双组分可逆反应： A+B P+S 其中B是廉价原料。 已知在某温度T时，平衡常数K=1，c A0 =c B0 =1mol/L，求此温度时的平衡转化率为多少? 为达到x A =0.9，可采取B过量的措施，问物料B的进料浓度至少应该是多少?
【简答题】Tom ________ better than to ask Dick for help. A) shall know B) shouldn’t know C) has known D) should have known
【单选题】What does the author mean by saying 'they know better now'?
A.
They know more about the causes of the drought.
B.
They have a better understanding of the drought in Africa.
C.
They have realized that the drought in Europe is the most serious one.
D.
They have realized that droughts hit not only Africa but also Europe.
【单选题】下列不是分支结构的语句是
A.
If ... Then ... EndIf
B.
While ... Wend
C.
If ... Then ... Else ... EndIf
D.
Select ... Case ... End Select
【单选题】writeris better known in China, Charles Dickens or Mark Twain?
A.
Whichever
B.
Whether
C.
What
D.
Which
【简答题】点B(-1,-1,1)在第______卦限
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