皮皮学，免费搜题
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【单选题】
蓼大青叶含（）A.
生物碱
B.
黄酮
C.
挥发油
D.
二蒽酮苷
E.
靛玉红
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【单选题】Mr Black decided to give up his farm and devote all his time to______ those children living on the streets.
A.
help
B.
helping
C.
be helping
D.
being helped
【简答题】气管插管分为经____和经____气管插管两种。
【单选题】Who was Jack?
A.
Alice's son.
B.
Mr Davis' boss.
C.
Alice's brother.
D.
Alice's husband.
【单选题】Can you make sure ______ the gold ring?
A.
where Alice had put
B.
where did Alice put
C.
where Alice has put
D.
where has Alice put
【简答题】某厂废水中含有质量分数为4.9%的H 2 SO 4 ，需中和后才能排放．某兴趣小组同学经过讨论，提出了两种中和方案，所用试剂的价格如下： 中和试剂 氢氧化钠 氢氧化钙 价格/（元?吨 -1 ） 800 450 （1）请从经济与产物角度说明选择氢氧化钙的理由： ①______； ②______． （2）有同学建议用氨水进行中和，可以回收一种化肥，其化学式为______．该废水还会引起的环境问题是__...
【单选题】Mr. Black decided to give up his farm and devoted all his time to _____ those children living on the street. [ ]
A.
help
B.
being helped
C.
be helping
D.
helping
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