以下滴丸基质中,可以采用水作冷凝剂的是()
A.甘油明胶
B.聚乙二醇4000
C.聚乙二醇6000
D.硬脂酸
E.硬脂酸钠
参考答案:D
—They all agree ________ George. Has the project been passed?
—Who ________ George can make the final decision?
A.except; except
B.except; besides
C.but; but
D.besides; but
下列实验设计及其对应的离子方程式均正确的是()
A.用FeCl3溶液腐蚀铜线路板:
B.Na2O2与H2O反应制备O2:
C.将氯气溶于水制备次氯酸:
D.用浓盐酸酸化的KMnO4溶液与H2O2反应,证明H2O2具有还原性: