【简答题】解释螺纹标记的含义:M12×1.5——5g6g——L——LH
【单选题】The rhetorical use of the sentence 'Thats one small step for a man, one giant leap for mankind' in Paragraph One is______.
【单选题】In 'I think it impossible for man to live on the Mars', 'it' is the ______ of the sentence.
【单选题】改变默认切换的设置时,序列中已使用的切换会受影响吗?
【判断题】人类有意识的外出旅行活动开始于原始社会初期,并在奴隶制社会时期得到了迅速的发展。 ( )