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【单选题】
下列有关物质的性质或用途的说法中，正确的是 ① 氯气具有漂白性，可以直接使有色布条褪色；② 二氧化硫具有较强的还原性，不能用浓硫酸干燥；③ Zn具有还原性和导电性，可用作锌锰干电池的负极材料； ④ 是两性氢氧化物，能溶于强酸或强碱。A.
①②③
B.
②③④
C.
③④
D.
①②④
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举一反三
【单选题】During the early American colonial years, corn was more plentiful than wheat, so corn bread was more common than wheat bread. Friendly Indians showed colonists how to grow corn and how to prepare it f...
A.
They were shown how by the Indians.
B.
They changed their wheat recipes.
C.
They knew the techniques before they arrived in America.
D.
They tried to make more nutritious bread.
【简答题】锌指(zinc finger)
【简答题】They decide to stop exporting wheat because as a result of the terrible drought, they are ______engouh food to feed the nation.
【单选题】Penny lovers and zinc-industry lobbyists oppose that______.
A.
customers can not bargain any more
B.
merchants would round the prices down
C.
coin's disappearance would cost consumers
D.
coin's demise would cost shopkeepers a lot
【简答题】锌指结构(zinc finger)
【单选题】根据《医疗机构制剂配制质量管理规范》，对医疗机构配制的制剂质量负责的是
A.
医疗机构负责人
B.
医疗机构药学部门负责人
C.
制剂室负责人
D.
药检室负责人
E.
药检人员
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