单选题：锅炉本体受热面组合安装的一般程序是：设备清点检查→（　　）试验→联箱找正划线→管子就位对口、焊接。

题目内容：
锅炉本体受热面组合安装的一般程序是：设备清点检查→（　　）试验→联箱找正划线→管子就位对口、焊接。 A．压力
B．气密焊
C．灌水
D．通球

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It's impossible to approach this problem in this way.

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