【单选题】I think maths is not P . E
【单选题】以下各种燃气的密度值大小比较正确的为( )。
【单选题】I think maths is ________ than Chinese.
【单选题】—Which subject is _____, Chinese or maths? —I think maths is.
【单选题】I think maths is very boring.
【单选题】I think maths is _____ difficult than English.
【单选题】天然气的相对密度是指在同温同压条件下,天然气的密度与空气的密度之( )。
【判断题】天然气的密度比空气重,一旦泄漏,容易在地面积聚