【简答题】许多城市为了创建“适宜人类居住的城市”,正在采取有力措施提高空气质量.如规定所有机动车要安装尾气净化器,里面有一种汽车尾气净化催化剂--三效催化剂(TWC),它的特点之一是使一氧化碳和一氧化氮反应,生成两种无毒的气体,一种是绿色植物光合作用所需要的一种气体,另一种是空气中含量最多的气体. 问: (1)写出一氧化碳与一氧化氮反应的文字表达式? (2)简述TWC的特征,并说明它是否在短时间内需要反复更...
【简答题】根据图片或中文完成下面的语段。 Look at the picture. The ___________ (男孩) is John. The ___________ (女孩) is Chen Jie. They are in the ___________. Miss White is their ___________ (老师) and ___________ (朋友).
【简答题】听录音,选择你所听到的句子。 ( ) 1. A. Good morning! B. Goodbye! ( ) 2. A. This is Miss White. B. This is Sarah. ( ) 3. A. Touch your face. B. Touch your nose. ( ) 4. A. Nice to meet you. B. I'm Che...
【简答题】用适当的人称代词和物主代词填空。 1. _____ am a student. _____ name is Millie. 2. Mr Chen is an old man, _____ is happy. _____ coat is very nice. 3. Lily and Miss Xue are good friends. Look, _____ are swimming in the ...
【单选题】和谐内5型内燃机车()是全列车制动系统和机车上其他气动装置的压力空气源
【单选题】在Raptor中,选择结构用( )符号实现。
【简答题】读下面对话,判断句子正误,正确的在括号内打“√”,错误的打“×”。 Miss White: How are you, Chen Jie? You look sad today. Chen Jie: Yes, I am sad. I failed the English test. Miss White: It doesn't matter. Try your best. You'll be bet...