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【单选题】
图象的分辩率为300象素每英寸则每平方英寸上公布的象素总数为()。A.
300
B.
600
C.
90000
D.
900000
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【简答题】下图所示电路中的开关已经闭合了很长时间，在t=0时打开，求t>0时电路的时间常数t =（）ms。（精确到整数）【图片】
【单选题】电路图如下所示，开关动作前电路处于稳态，已知：【图片】t=0时刻，开关S闭合，试求电路的时间常数=（ ）ms。【图片】
A.
0.06
B.
0.6
C.
6
D.
60
【简答题】为了使 V 带(三角带)与带轮轮槽更好地接触,轮槽角应 _______ 于 V 带截面的楔角 f ,随带轮直径减小,角度的差值越 ____________ 。
【单选题】That afternoon Molly almost danced along the street, as she walked home with her father from the station. They had seen Mrs. Gibson and Cynthia off to London. She wished her step - mother would take h...
A.
She was looking forward to Mrs. Gibson's return.
B.
She was delighted to be alone with her father.
C.
She hated being apart from Cynthia.
D.
She wished she had gone to London too.
【单选题】They arrived home very wet, as they had walked all the way______ the rain.
A.
in
B.
under
C.
into
D.
with
【简答题】什么叫锐线光源?在原子吸收光谱分析中为什么要采用锐线光源?
【简答题】下图所示电路中的开关已经打开了很长时间，在t=0时闭合，求t>0时电路的时间常数t =（）ms。（精确到整数）【图片】
【简答题】As they walked home slowly, Martin walked in front with another peasant talking about the sowing, and Mary walked behind, with her eyes on the ____________, thinking.
【单选题】听力原文： That afternoon Molly almost danced along the street, as she walked home with her father from the station. They had seen Mrs. Gibson and Cynthia off to London. She wished her stepmother would tak...
A.
She wished she had gone to London too.
B.
She was delighted to be alone with her father,
C.
She was looking forward to Mrs. Gibson's return.
D.
She hated being apart from Cynthia.
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