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【单选题】
— Why didn't you come and open the door for me, dear? — Sorry, Jack. I _____ in the kitchen and didn't hear you. [ ]A.
was cooking
B.
am cooking
C.
have cooked
D.
will cook
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【单选题】My father helps me with my homework______ he has time.
A.
wherever
B.
who
C.
which
D.
whenever
【单选题】A person has a comparative advantage in an activity whenever he or she
A.
has an absolute advantage in the activity.
B.
can perform the activity at a lower opportunity cost than can anyone else.
C.
can do the activity in less time than anyone else.
D.
can do everything better than anyone else.
【判断题】European Charter of Patients' Rights (2002) declares that, "Each individual has the right to complain whenever he or she has suffered a harm and the right to receive a response or other feedback. Each...
A.
正确
B.
错误
【简答题】“电源—电弧”系统稳定,包含哪两方面的含义?为保证“电源—电弧”系统稳定,在电源外特性曲线与电弧静特性曲线的交点位置,应保证两曲线的斜率满足何种关系?
【简答题】为保证屋架的空间稳定性,需在屋架的上下弦设置系杆,按受力性质可将系杆分成如下两类: 、 。
【简答题】A. is keen on B. definite C. admire D. make up his mind E. keep a goal in mind 1. Your English is so good. I _______ you. 2. Linda ________ classical music, so she attends ...
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