航天技术是一个国家现代技术综合发展水平的重要标志。
参考答案:对
I refuse to accept the blame for something ________ was someone else's fault.[ ]
A. who
B. that
C. as
D. what
下列工种中,哪一工种易患全身性振动病
A.铆工B.拖拉机手C.砂轮工D.电锯工E.风铲工