单项选择题

专供集中供暖散热器用的钢铁制螺栓 ( )

A．24
B．25
C．18
D．16
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单项选择题
乙醚(二乙基醚) ( )
A．17
B．20
C．21
D．22
单项选择题
The ______ contract is a contract between a party who agrees to accept the risk and a party seeking protection from the risk.
A．payment
B．production
C．shipment
D．insurance
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