If I might _________ a guess , I'd say she was about thirty.
A. hazard
B. hazards
C. hazarding
D. hazard
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The news plunged them into deep __________ .
A. depress
B. depressing
C. depressed
D. depression
分组统计查询语句中,分组子句的关键字是________。
A. group by
B. order by
C. having
D. ABC都不是
在分组统计查询语句中,如果出现having子句,一定会出现group by子句。
A. 对
B. 错
尿液的生成不经过
A. 肾小体的滤过
B. 肾小管的重吸收和分泌
C. 肾小管的合成
D. 集合管的重吸收和分泌