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freeze drying technology

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It is in February that came the historic visit of Nixon to China. During the visit Sino-America Joint Communique was signed, which agreed on the fact that there was only one legal government in China, that of the Peoples Republic of China.

A. 1971
B. 1972
C. 1979
D. 1981

______is the capital city of Ontario, which is also the multicultural, entertainment, financial, and business capital of Canada.

A. Ottawa
B. Toronto
C. Quebec
D. Montreal

属于高压压力容器的是()。
A1.5MPa
B2.05MPa
C10MPa
D205MPa

换热器因水质不好或油品杂质多而形成水垢及油垢的结焦沉淀，一般应用哪种清理方式﹙ ﹚。
A机械清理
B高压水清理
C冲洗
D化学清洗