初级内燃装卸机械修理工应知内燃装卸机械的点检、（）和检修知识及标准。
A、保养
B、大修
C、革新
D、更换
参考答案：A
44. We must _____ good relations with our classmates because co-operation is essential to us, modern people.
A．do
B．put
C．build
D．Set
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