下列旅游类客户不能直接列为支持类客户的是()
A.世界自然遗产
B.国家级旅游度假区
C.国家旅游局认定的4A级旅游景区
D.国家重点风景名胜区
参考答案:C
Her hands________rough.She must have done a lot of heavy physical work.[ ]
A. were felt
B. are felt
C. are feeling
D. feel
相对密度较()的液体化工样品适宜于选用加重型采样器。