What is the result？（） ["w-f","f-p，w-f","w-f，b-f","f-p，w-f b-f","Compilation fails.","An exception is thrown at runtime."]
可燃气体检测器为隔爆型防爆设备，不得在超出规定的范围使用。检测器不得在含（）的场合使用。 ["碳","铅","硫","氢"]
设备基础一般应分层浇筑，每层混凝土的厚度为200～300mm，并（）。 ["允许上下层之间留设施工缝","保证上下层之间不留施工缝","保证下层初凝后再浇筑上层","保证下层终凝后再浇筑上层"]
A customer has 2 DS1s to add between adjacent nodes in a UPSR ring. What type of circuit should you recommend?（） [" VT circuits"," STS circuits"," VT tunnel circuits"," 1:1 protection circuits"," 1:N protection circuit"]
患者，女性，30岁，甲状腺大部分切除术后5h，出现进行性呼吸困难，烦躁不安，发绀。体检发现颈部增粗，切口有血液渗出。考虑患者发生了“呼吸困难”并发症。对该并发症，首选的处理措施是（） ["气管插管","吸氧","压迫止血","气管切开","拆除切口缝线，敞开伤口，去除血块"]
用益物权
