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【单选题】
下列选项中描述错误的是（）？A.
百分比是指不同时期以百分数的形式表示的相对指标的变动幅度
B.
百分比是一种表达比例、比率或分数数值的方法
C.
百分比也称为百分率或百分数
D.
百分比通常不会写成分数的形式，而是采用符号“%”来表示。
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举一反三
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A.
is
B.
was
C.
has been
D.
had been
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A.
中国科技信息研究所
B.
中国名师讲坛
C.
高校精品课程系列
D.
凤凰卫视系列
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A.
所属频道为CCTV-7系列
B.
视频有讲义下载
C.
所属学科为工程技术
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视频均有字幕
【单选题】Your database contains two temporary tablespaces named TEMP and TEMP1. The TEMP tablespace is the default temporary tablespace for the database， and the TEMP1 tablespace was created at database creati...
A.
DROP TABLESPACE temp1；
B.
DROP TABLESPACE temp1 INCLUDING CONTENTS；
C.
DROP TABLESPACE temp1 INCLUDING CONTENTS AND DATAFILES；
D.
DROP TABLESPACE temp1 INCLUDING CONTENTS CASCADE CONSTRAINTS；
【单选题】The man who spoke at the meeting yesterday ______ his brother.
A.
was
B.
had been
C.
has been
D.
is
【单选题】The man who spoke at the meeting yesterday ______ his brother.
A.
has been
B.
have been
C.
is
D.
was
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