装卸货物车，如在电气化区段上作业时，必须在接触网（）后方准进行。
参考答案：停电
A foreigner's first impression of the U.S. is likely to be ________ everyone is in a hurry ---- often under pressure.
a. what b. that c. which d. one in which
采用柔性版印刷表面粗糙的承印物，其印版（）。
A、硬度要高，弹性要大
B、硬度要高，弹性要小
C、硬度要小，弹性要大
D、硬度要小，弹性要小
