简述17号车钩缓冲装置组成?
参考答案:
17号车钩缓冲装置主要由下 * * 种零部件组成:17号车钩组成、17号钩尾框、17号从板、17号钩尾销、MT-2型缓冲器等。
—Look at those clouds!
—Don't worry. ________it rains, we'll still have a great time. [ ]
A. Even if
B. As though
C. In case
D. If only
桥枕为何要腻缝?