经调节后的空气被分配给：（）.
A.驾驶舱，货舱及客舱
B.驾驶舱，前后客舱
C.驾驶舱，航空电子舱，客舱
参考答案：B
Just as Kobe Bryant said, Yao Ming has built the bridge for all of us, _____ is not only for the sport
of basketball ,but for the different cultures of this world.
[ ]
A. who
B. it
C. which
D. that
按照石墨的形状特征，铸铁可分为三大类，分别是灰口铸铁（石墨成片状）、可锻铸铁（石墨成团絮状）和（）。
A．普通铸铁
B．球墨铸铁
C．变质铸铁
D．耐磨铸铁
