油箱内使用的加热器应设置在（）侧。
A．进油管
B．回油管
C．低压管
D．高压管
参考答案：B
供气消防车可同时充气气瓶数量≥4只，灌充充气时间＜2min。
Nobody believed his reason for being absent from the class ________ he had to meet his uncle at the airport.
A．why
B．that
C．where
D．because
