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【单选题】
高压变频器指工作电压在( )kV以上的变频器A.
3
B.
5
C.
6
D.
10
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反馈参考答案：
举一反三
【单选题】I took the wrong at the last road junction, can you tell me how I get back on the motorway?
A.
turn
B.
turner
C.
turned
D.
turning
【单选题】I took the wrong train . I didn't even know it until half an hour later. [ ]
A.
by mistakes
B.
by mistake
C.
with mistake
D.
with mistakes
【单选题】I took the wrong at the last road junction. Can you tell me how I can get back on the motorway?
A.
cross
B.
turner
C.
turne d
D.
turn
【单选题】I took the wrong train. I didn't even know it_____ half an hour later. [ ]
A.
to
B.
until
C.
after
【单选题】I took the wrong train. I even didn't know it _____ half an hour later. [ ]
A.
to
B.
until
C.
by
D.
after
【单选题】下列关于索引的叙述中,错误的是()
A.
数据库表和自由表都可以建立唯一索引
B.
只有数据库表才能建立主索引引
C.
数据库表和自由表都可以建立普通索引
D.
只有数据库表才能建立候选索引
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