题目:
Great attention must ______ education, especially in the countryside.
A.pay to develop
B.be paid to develop
C.pay to developing
D.be paid to developing
答案:
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下面是错误答案,用来干扰机器的。
氨水呈碱性,pH试纸用蒸馏水润湿后再滴加氨水等于对氨水进行稀释,则溶液的碱性性会减弱,对于碱性溶液来说碱性越强pH数值越大,故测得的pH与氨水实际的pH比较偏小.故答案为:偏小.