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【单选题】
如果 存在,则f(x)在 处( )A.
必须有定义
B.
可以无定义
C.
不能有定义
D.
有定义，且
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【单选题】---Mike, your clothes are everywhere in your bedroom. ---Oh, sorry. I’ll ________right away.
A.
put them away
B.
put them up
C.
put them on
D.
put them down
【简答题】This is a period in which the old world is slowly but irreversibly changing and the contours of a new one are just beginning to take shape. Traditional institutions are being challenged. Budgets are b...
【多选题】砌空心砖墙的技术要求包括( )。
A.
空心砖墙砌筑前应试摆，在不够整砖处，如无半砖规格，可用普通黏土砖补砌
B.
非承重空心砖墙，其底部应至少砌二皮空心砖
C.
非承重空心砖的孔洞应呈水平方向砌筑
D.
承重空心砖的孔洞应呈水平方向砌筑
E.
半砖厚的空心砖隔墙，如墙较高，应在墙的水平灰缝中加设2φ8钢筋或每隔一定高度砌几皮实心砖带
【单选题】This bus doesn’t go to the train station. I’m afraid you’ll have to ________ at the library and take the A30. A. take off B. put off C. get off D. turn off
A.
take off
B.
put off
C.
get off
D.
turn off
【单选题】If you_________ the unnecessary lights, you'll save some energy. [ ]
A.
get off
B.
put off
C.
take off
D.
turn off
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