【单选题】发电机输出端接上三相对称负载时,定子电枢磁场是一个( )磁场。
【单选题】Qian's travel agency has cut Disneyland from its Hong Kong tour itinerary for the sake of high costs for it.
【单选题】1949年9月21日,毛泽东在中国人民政治协商会议第一届全体会议上发表的开幕词是( )。
【单选题】1949年9月21日,毛泽东在中国人民政治协商会议第一届全体会议上发表的开幕词是( )
【单选题】1949年9月21日,毛泽东在中国人民政治协商会议第一届全体会议上发表的开幕词是( )
【单选题】What is NOT the woman's qualification for the new position?
A.
She has once been a tour guide.
B.
She has five years' working experience in travel agency.
C.
She is sociable and can cope with new situations well.
D.
She is very loyal, obedient and good-tempered.
【单选题】How many cities has Lucy‘s U.S. tour plan already included? 查看材料
【单选题】1949年9月21日,毛泽东在中国人民政治协商会议第一届全体会议上发表的开幕词是()
【单选题】After your tour request has been confirmed, ______.
A.
it is still possible that your tour may be cancelled
B.
you are still allowed to change your visiting date
C.
you can surely visit the White House that day
D.
it is necessary for you to start your tour immediately
【单选题】(2019·南京、盐城二模)下列说法正确的是 ( )
A.
反应CH 4 (g)+H 2 O(g) CO(g)+3H 2 (g)在一定条件下能自发进行,该反应一定为放热反应
B.
可用牺牲阳极或外加电流的阴极保护法延缓钢铁水闸的腐蚀
C.
Na 2 O 2 与水反应产生1molO 2 ,理论上转移的电子数目约为4×6.02×10 23
D.
保持温度不变,向稀氨水中缓慢通入CO 2 ,溶液中 的值增大