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单选题
509、Operation of the handle releases the gas, and the slide-raft inflates. 操作手柄释放气体，和滑梯充气。
A
Through releasing the handle, the gas starts to inflate the slide-raft.
B
Operation of the handle releases the gas which can inflate the slide-raft.
C
The gas handle operates to inflate the slide-raft.
答案解析
正确答案：B
相关知识点：
手柄放气可充滑梯筏
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