电磁流量计垂直安装时，介质有何要求？
参考答案：
在垂直安装时：
①介质流动方向应该自下而上；
②经过变送器确保测量内充满介质。
排放瓦斯应注意的事项有（）。
A．了解停电、停风时间及瓦斯积聚情况
B．了解通风机情况
C．掌握排放回风线路各区间的风量及瓦斯浓度
D．了解排放瓦斯时采取调节风量的条件
E．回风线路各通道设岗
Mike _______ in touch with his former schoolmates, who had been living there for ages, as soon as he
arrived in America. [ ]
A. is bound to get
B. set about getting
C. get down to get
D. set out getting
