【单选题】数据电文根据双方约定需要确定收讫,但未约定确认收讫方式的,收件人可以( )向发件人表明该数据电文已经收到;
【多选题】数据电文根据双方约定需要确认收讫,但未约定确认收讫方式的,收件人可以( )向发件人表明该数据电文已经收到。
【判断题】远离作业即距离带电部分2m及其以外的高空作业和较复杂的地面作业。()
【单选题】听力原文: There was once a man in South America who had a parrot, a pet bird that could imitate human speech. The parrot was unique. There was no bird like him in the whole world. He could learn to say an...
A.
It looks like human being.
B.
It looks different from other birds.
C.
It could learn to say most of words.
D.
It could not imitate human speech.
【单选题】男性,64岁,常感心悸,心脏听诊未闻及杂音,超声心动图检查示心尖部心肌肥厚,下列具有诊断意义的心电图表现最可能是
【单选题】搅拌混凝土时采用一次投料法,下列各种顺序哪种较为合理()。