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【单选题】
I went there in 1984, and that was the only occasion when i __ the journey in exactly two days.(2005)
A.
Must take
B.
Must have made
C.
Was able to make
D.
Could make
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【单选题】If you want to establish a call via the Inmarsat, you shall select the land earth station
A.
which must be in Westem European waters
B.
which may be anyone of the Inmarsat LESs
C.
which must be inthe POR or IOR
D.
which must be in the same ocean region that your ship ls currently operating
【简答题】在异步通信中,数据的传输单位为帧,一帧信息由四部分构成,即()、()、()和()。
【简答题】三极管实现放大的外部条件发射结(),集电结()
【单选题】室内型wlan设备的最大发射功率一般不得超过()
A.
50mw
B.
100mw
C.
500mw
D.
1000mw
【单选题】Use the mouse or arrow keys to move the insertion point to the beginning of the text that you want to select. Hold the ____ key down while you use the arrow keys to select text.
A.
Shift
B.
Alt
C.
Tab
D.
F3
【简答题】已知反比例函数y= 12 x 的图象和一次函数y=kx-7的图象都经过P(m,2).有A、B两点在这个一次函数的图象上,过A、B向x轴作垂线,与这个反比例函数的图象分别交于C、D两点,连接C、D,若CD=AB,且A和B的横坐标分别为2和2+a. (1)求这个一次函数的解析式; (2)求a的值; (3)求四边形ABCD的周长.
【简答题】已知:抛物线y=-x 2 +2x+m-2交y轴于点A(0,2m-7).与直线 y= x交于点B、C(B在右、C在左). 小题1:求抛物线的解析式 小题2:设抛物线的顶点为E,在抛物线的对称轴上是否存在一点F,使得 ,若存在,求出点F的坐标,若不存在,说明理由 小题3:射线OC上有两个动点P、Q同时从原点出发,分别以每秒 个单位长度、每秒2 个单位长度的速度沿射线OC运动,以PQ为斜边在直线BC的上...
【单选题】If you want to select courses you'd better______.
A.
call up the Office of Student Services
B.
get in touch with the Admissions Office
C.
read your acceptance letter
D.
visit Student Services' website
【简答题】已知椭圆 C: x 2 a 2 + y 2 b 2 =1(a>b>0) 的离心率为 2 2 ,其左、右焦点分别为F 1 ,F 2 ,点P(x 0 ,y 0 )是坐标平面内一点,且 |OP|= 7 2 , P F 1 ? P F 2 = 3 4 (O为坐标原点). (1)求椭圆C的方程; (2)过点 S(0,- 1 3 ) 且斜率为k的动直线l交椭圆于A、B两点,在y轴上是否存在定点M,使以AB为直...
【判断题】使用化妆品新原料生产化妆品,不须经国务院卫生行政部门批准。
A.
正确
B.
错误
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