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【单选题】
硫酸镁中毒时最先出现的反应是A.
膝反射消失
B.
肌张力减退
C.
呼吸抑制
D.
尿量减少
E.
心脏停搏
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【单选题】听力原文： A fire broke out in a Buenos Aires nightclub, which packed with young revelers celebrating the New Year holidays. It killed at least 175 people when a crowd was trapped by locked doors, official...
A.
The doors were locked.
B.
A flare fired into the club's ceiling.
C.
There was a rock concert.
D.
People are too crowded.
【简答题】读欧洲西部地形图和欧洲西部气候图，回答下列问题： （1）从纬度位置看，欧洲西部大部分地区位于地球五带中的______带。 （2）北极圈穿过了欧洲北部，在每年6月22日前后，北极圈以内的地区会出现_____现象。（在“极昼”或“极夜”中选择一个正确答案填入） （3）欧洲西部地形以平原为主，南部著名的山脉是________山脉。 （4）欧洲西部大西洋沿岸主要属于_________气候。 （5）欧洲西部...
【简答题】一个简谐振动的表达式为x=Acos(3t+φ)，已知t=0时的初位移为0．04m，初速度为0．09m·s-1，则振幅为_________，初相为_________．
【单选题】听力原文： A fire broke out in a Buenos Aires nightclub, which packed with young revelers celebrating the New Year holidays. It killed at least 175 people when a crowd was trapped by locked doors, official...
A.
The doors were locked
B.
A flare fired into the club's ceiling.
C.
There was a rock concert.
D.
People are too crowded
【单选题】All the settlers nearby demanded that the nightclub _______ away as soon as possible because of the loud noise at night.
A.
must be moved
B.
might be moved
C.
should move
D.
be moved
【简答题】一简谐振动的表达式为 ,已知 t = 0 时的初位移为 0.04 m,初速度为 0.09 m/s,则振幅 A =________m。
【单选题】一简谐振动的表达式为y=Acos(3t+φ) ，已知t= 0时的初位移为0.04 m，初速度为0.09 m/s，则振幅A为多少？
A.
0.05m
B.
0.03m
C.
0.06m
D.
1m
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