应将客房状况及时通知总台的有（）。
A.S/O
B.L/B
C.N/B
D.VD
参考答案：A, B, C
Children who are not active or ______diet is high in fat will gain weight quickly. [ ]
A. what
B. whose
C. which
D. that
60kg/m钢轨12号提速道岔，为何在固定型辙叉的护轨范围内要在辙叉垫板下增设6mm厚塑料垫片找平？
