储存易燃、易爆危险化学品的建筑,必须安装避雷设备。
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健美运动是一门通过徒手和各种(),运用专门的动作方式方法进行锻炼的。
A. 单杠
B. 器械
C. 枪棍
D. 杠铃
The()is concerned with successful election, whereas the statesman is interested in future of his people.
A. politics
B. politician
C. political
D. politically
按ZBJ 04005-87标准规定,荧光渗透探伤时,被检物表面上的标准荧光强度应大于()lx