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【简答题】
电场强度 ,其复数形式为 。
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举一反三
【单选题】下列物质中,酸性最强的是( )。
A.
NH3
B.
HV03
C.
HN03
D.
H2Si03
【单选题】下列物质中酸性比H2Ge03弱的有( )。
A.
H3As04
B.
H2Si03
C.
H3Ga03
D.
H3P04
【多选题】以下有关TS的说法,正确的是(    )
A.
TS 1~3分者生理紊乱大,病死率高
B.
TS 4~13分者生理紊乱显著,抢救价值很大
C.
TS 14~16分者,生理紊乱小,存活率高,不需急救
D.
TS≤13分,为重伤送往创伤中心治疗的标准
E.
TS法中的毛细血管再充盈和呼吸幅度观察误差较大,可以去除
【判断题】我们实验所用的721型分光光度计适合对在可见光区有吸收的物质进行测定.
A.
正确
B.
错误
【简答题】Many people think the more time is spent, the __1___work will be done, so students have to spend the whole __2_doing school work except the three meals .It is __3__to see students struggling (奋斗) in a...
【单选题】Chinese students usually spend ______ the students of the US studying in their free time.
A.
twice as many hours as
B.
as twice many hours as
C.
twice hours as many as
D.
as many as twice hours
【单选题】American students spend ________ time _______ homework than Chinese students. [     ]
A.
fewer, doing
B.
less, to do
C.
less, doing
D.
least, doing
【简答题】Middle school days are both fun and busy. Students spend their days in class, 1 to the interesting or sometimes boring words of their teachers. At break (休息) , they run, play and shout happily . But 2...
【简答题】每个子帧包含7个主时隙()、TS1~TS6和3个特殊时隙DwPTS、UpPTS、GP。
【判断题】只有加约束的草图曲线才有参数,普通曲线都是没有参数的。
A.
正确
B.
错误
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