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Passage 4 Jesse Owens was born in Alabama, USA, in 1913. He came from a poor family, so he had many part-time jobs as a student. He worked hard, but still found time for his favorite pastime, running. His natural talent made him a track star at high school and, then, at university. On 25 May 1935, at the Big Ten Championships in Michigan, Jesse became a world champion. He broke three world records in one day! For the next 30 years, nobody could break those records. Jesse Trained hard and took part in the 1936 Olympic Games in Berlin. He was the first American in the history of Olympic Track and Field to win four gold medals in one Olympic Games: the 100m and 200m sprints, the long jump and the 4×100m relay. However, Jesse’s success as an athlete didn’t help him financially. He had lots of different jobs and worked hard to support his family. He died in 1980 and to this day, his family runs the Jesse Owens Foundation, which gives young athletes with financial problems a chance in the world of sports.
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【简答题】在纯电阻交流电路中,已知电路端电压u=311sin(314t-60o)V,电阻R=10Ω,则电压与电流的相位差φ= 。
【简答题】在纯电阻交流电路中,已知电路端电压 u=311sin(314t-60o)V,电阻R=10Ω,则电流I= ‍ A,电压与电流的相位差 φ = 0o
【简答题】在纯电阻交流电路中,已知电路端电压 V, 电阻 R = 10Ω, 则电流I = 22 A,电阻消耗的功率P= ()W
【简答题】在纯电阻交流电路中,已知电路端电压u=311sin(314t-60o)V,电阻R=10Ω,则电流I= A。
【单选题】2 控制配伍稳定性关键因素 不包括哪些()
A.
适时冷藏
B.
即配即用
C.
溶媒的选择
D.
注意观察和记录
E.
注意避光
【简答题】在纯电阻交流电路中,已知电路端电压u=311sin(314t-60o)V,电阻R=10Ω,则电流I= A,电压与电流的相位差 φ = ,电阻消耗的功率P= W
【单选题】有关电解质的下列叙述正确的是 [     ]
A.
甲酸溶液导电性比乙酸溶液导电性强,说明乙是弱酸
B.
氧化钾溶于水能导电,所以氧化钾是电解质
C.
强电解质一定是含有离子键,弱电解质中一定含弱极性共价键
D.
某物质能导电,说明该物质一定含有自由移动的微粒
【多选题】关于乙酸乙酯溶解性的叙述正确的有
A.
难溶于水
B.
难溶于饱和碳酸钠溶液
C.
溶于氢氧化钠溶液
D.
易溶于乙醇
【单选题】患者,女性, 25岁。停经45天,阴道少量流血2天,伴下腹部轻度酸痛,尿妊娠试验(+),妇科检查:宫口闭,子宫6周妊娠大小。 对该患者的护理,下列哪项是正确的( )
A.
立即做清宫术准备
B.
做凝血功能检查
C.
顺其自然,不做处理
D.
绝对卧床休息
【单选题】关于乙酸溶解性的叙述对的是
A.
难溶于水
B.
用分液漏斗可以把乙酸从水中分离出来
C.
易溶于酒精
D.
只能溶于酒精一种溶剂
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