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【单选题】
当元件两端电压与通过电流取关联参考方向时,即为假设该元件( )功率; 取非关联参考方向时,即为假设该元件( )功率。
A.
吸收,发出
B.
发出,吸收
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【简答题】力偶对其作用平面内任一点之矩恒等于()。
【单选题】---Could you tell me _________ tomorrow morning? ---Well, it will start at half past eight.
A.
when the meeting will start
B.
when the meeting started
C.
when will the meeting start
【单选题】He (start) swimming at the age of eight.
A.
start
B.
started
C.
is starting
D.
have start
【简答题】力偶对其作用平面内任一点之矩都等于力偶矩,而与________无关。
【简答题】力偶对任一轴上的投影代数和(),力偶对其作用平面内任一点之矩恒等于()。
【简答题】力偶对其作用平面内任一点之矩都等于力偶矩,而与 无关;力偶在任一轴上的投影等于 。力偶只能与 平衡。
【简答题】力偶对其作用平面内任一点之矩都等于力偶矩,而与矩心位置 关。
【单选题】Let's start the trip ______ half past eight ______ the morning of February 21. [     ]
A.
at; on
B.
at; in
C.
/; in
D.
about; by
【单选题】Let’s watch the news on CNN. It at eight o’clock.
A.
will start
B.
is starting
C.
is going to start
D.
starts
【简答题】听下面的对话,回答1-2题。 1. When does Peter's school day start? [     ] A. At eight B. At eight fif C. At eight twenty-five 2. Who finds English very interesting? [     ] A. Millie. B. Peter. C. Lucy.
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