扬尘污染货与易碎品的积载要求分别是()。
A.二者都先卸后装
B.二者都先装后卸
C.前者应先卸后装,后者应先装后卸
D.前者应先装后卸,后者应先卸后装
参考答案:D
In the face of all these difficulties, we're not discouraged and________good spirits.[ ]
A. keep up
B. go up
C. hold up
D. pick up