多项选择题
引起呼吸道平滑肌强烈收缩的体液因素是()
A.5-羟色胺B.肾上腺素C.缓激肽D.去甲肾上腺素E.以上全错
单项选择题 The heavy storm yesterday set the record for the heaviest rainfall________in a single day.
未知题型 关于肺泡通气血流比值描述正确的是( )
单项选择题 She can’t speak Spanish so she felt a bit________among a group of LatinAmerican visitors.