请你参与“居安思危,壮我中华”的研习活动。
安装横担时,上层横担准线与水泥杆顶的距离为()mm ["50","100","200","250"]
采用湿制颗粒制备中药片剂,压片前的颗粒含水量一般为() ["A.1%~3%","B.3%~5%","C.5%~7%","D.8%~9%","E.10%~13%"]
变压器铁心应在()情况下运行。 ["一点接地","两点接地","多点接地"]
中国药典规定"凉暗处"系指() ["不超过0℃","避光且不超过5℃","避光且不超过10℃","不超过20℃","避光且不超过20℃"]
你知道当前中国天然气管道的长度和输送能力吗?