油船按所装载货油种类，可概略地分为两的类、原油船和（）。
A、L.P.G船
B、散化船
C、成品油船
参考答案：C
It was the training _______ he had at school _______ made him a good jumper.[ ]
A. what; what
B. that; that
C. what; that
D. that; had
后牙为远中错，前牙深覆盖，其矫治原则为（）
A.矫治前牙反
B.减径或减数
C.矫正颌间关系，推上牙弓往后，或牵下牙弓向前，或两者并用
D.缩小牙弓或结合修复治疗
E.以上都不是
