单项选择题

It is a new-type double-sided piping with corrosion protection and pressure ______.

A．insistence
B．persistence
C．resistance
D．reservoir
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单项选择题
In ______ to his brother, he was always considerate in his treatment of others
A．contrary
B．contract
C．contrast
D．contact
单项选择题
If a citizen's complaint is justified, the government will act ______.
A．on his behalf
B．on his account
C．for his sake
D．in his interest
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