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爆炸性粉尘环境根据爆炸性粉尘混合物出现的频繁程度和持续时间分为( )。
下列指标中,属于房地产投资项目经济评价静态指标的有( )。
红细胞并排时,不能通过()
发泡陶瓷保温板的施工操作中,挤塑板安装的表面平整偏差如何解决()
光波是一种高频电磁波,不同波长(频率)的光波复用在一起进行传输,彼此之间相互作用,提高光功率,利于长距离传输。
描述人的心理的实质不正确的是( )
微电子交流计数自动闭塞能保证通过信号机显示绿灯时,前方至少有()个自动闭塞分区是空闲的。
男性,35岁,高热,皮肤瘙痒半个月,右颈及锁骨上淋巴结肿大,无压痛,互相粘连,血红蛋白90g/L,白细胞10×109/L,中性粒细胞0.66,淋巴细胞0.24,骨髓涂片找到里-斯细胞。如需明确诊断首先应作的检查是()
农业环境具有()的特征。
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