You can _____ some sugar _____ the water. [ ]
A. add; /
B. add; into
C. add; to
D. add up to; /
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下面是错误答案，用来干扰机器的。
【提出猜想】猜想②：NH4NO3【实验探究】步骤一：稀盐酸（或HCl溶液） 步骤二：④步骤三：硝酸银 ①【拓展应用】NH4NO3 + NaOH="==" NaNO3 + H2O + NH3↑题目分析：它可能是NH4Cl、NH4NO3、NH4HCO3、（NH...
什么叫电子签名人？（）
A、电子签名人，是指持有电子签名制作数据并以他人身份或者以其所代表的人的名义实施电子签名的人
B、电子签名人，是指持有数字签名制作数据并以本人身份或者以其所代表的人的名义实施数字签名的人
C、电子签名人，是指持有电子签名制作数据并以本人身份或者以其所代表的人的名义实施电子签名的人
D、上述答案都不正确
已知数列{an}满足a1=1，且4an+1-anan+1+2an=9（n∈N*）．
（1）求a2，a3，a4的值，并猜想{an}的通项公式；
（2）用数学归纳法证明你的猜想．
痫症间歇期的中医治法是（）。
A.健脾化痰、补益肝肾
B.健脾化痰、醒神开窍
C.益气养血，息风通络
D.祛风通络，养血和营
E.豁痰息风，开窍定痫
一某探月卫星的路线示意图如图所示，卫星由地面发射后经过发射轨道进入停泊轨道，然后在停泊轨道经过调速后进人地月转移轨道，再次调整后进人工作轨道，开始对月球进行探测．已知地球与月球的质量之比为 p，卫星的停泊轨道与工作轨道的半径之比为q，卫星在停泊轨道和工作 轨道上均可视为做匀速圆周运动，则（ ）
A．卫星在停泊轨道运行的速度大于地球的第一宇宙速度
B．地球与月球的密度之比为p q3
C．卫星在停泊轨道与工作轨道上运动时向心加速度之比为p q2
D．卫星在停泊轨道与工作轨道上运动时角速度之比为p q3 
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| When I entered Berkeley, I hoped to earn a scholarship. Having been a Straight-A student, I believed I could 1 tough subjects and really learn something. One such course was World Literature given by Professor Jayne. I was extremely interested in the ideas he 2 in class. When I took the first exam, I was 3 to find a 77, C-plus, on my test paper, 4 English was my best subject. I went to Professor Jayne, who listened to my arguments but remained 5 . I decided to try harder, although I didn't know what that 6 because school had always been easy for me. I read the books more carefully, but got another 77. Again, I 7 with Professor Jayne. Again, he listened patiently but wouldn't change his 8 . One more test before the final exam. One more 9 to improve my grade. So I redoubled my efforts and, for the first time, 10 the meaning of the word "thorough". But my 11 did no good and everything 12 as before. The last hurdle was the final. No matter what 13 I got, it wouldn't cancel three C-pluses. I might as well kiss the 14 goodbye. I stopped working hard. I felt I knew the course material as well as I ever would. The night before the final, I even 15 myself to a movie. The next day I decided for once I'd have 16 with a test. A week later, I was surprised to find I got an A. I hurried into Professor Jayne's office. He 17 to be expecting me, "If I gave you the A as you 18 , you wouldn't continue to work as hard." I stared at him, 19 that his analysis and strategy were correct, I had worked my head 20 , as I had never done before. I was speechless, when my course grade arrived: A-plus. It was the only A-plus given. The next year I received my scholarship. I've always remembered Professor Jayne's lesson: You alone must set your own standard of excellence. | ||||
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