“全面检全面修”的检查范围和质量标准规定:提速铁路货车车钩缓冲装置的安全托板及钩尾销托梁螺母无松动、()。
参考答案:丢失
With no rain for three months, and the food supplies running out, the present __here is getting worse.
A.case
B.condition
C.state
D.situation
在海滩案发现场,留下罪犯清晰的脚印,公安人员立即用蜡浇铸了如图所示的鞋模,测量鞋模的平均厚度为3cm,质量为675g;又经测试达到同样深度压强达1.5×104Pa 。则罪犯的体重为多少?(ρ蜡=0.9×103kg/m 3)