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【多选题】
以下对圆弧角度标注法的描述正确的有?A.
圆弧角度标注法是借鉴机械制图的方法
B.
圆弧角度标注法是在有圆弧、斜线、夹角等规范图形时常用的制图标注法
C.
圆弧角度标注法可以与其他制图法结合使用
D.
圆弧角度标注法需要遵循机械制图的标注规范
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举一反三
【单选题】At last, about twent7 people ______ at the meeting.
A.
turned on
B.
turned up
C.
turned off
D.
turned out
【简答题】(2015· 北海 16 题 2 分 ) 小军姐弟俩为妈妈庆祝母亲节,他们使用电饭锅做饭,电磁炉蒸鱼,开着油烟机炒菜,刚启动烤箱烤鸡时,家里的空气开关 “ 跳闸 ” 了,原因可能是 ,小军暂时不使用烤箱,在手湿的情况下重新合上空气开关 ( 继续炒菜 ) ,这个做法 ( 选填 “ 符合 ” 或 “ 不符合 ” ) 安全用电原则.
【简答题】2 twent_eth ________
【单选题】Shopping habits in the United States have changed greatly in the last quarter of the twentieth century. (1)_____ in the 1990s most American towns and cities had a Main Street. Main Street was always i...
A.
As early as
B.
Early
C.
Early as
D.
Earlier
【单选题】The local health organization is reported ___twenty-five years age when Dr. Green became its first president.
A.
to be set up
B.
being set up
C.
to have been setup
D.
having been set up
【简答题】twentieth [ˈtwentɪəθ]
【简答题】集合M={1，2，3，4，5}的子集个数是______．
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