单项选择题

广域差分主要是为了削弱这些误差源，它们分别是大气延时误差、卫星钟误差（    ）。 A.
星历误差 B.
接收机误差 C.
电离层误差 D.
系统误差

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未分类题
Which of the following statements is NOT true?A.Sir Ludwig Guttmann is an early organizer of the games for the disableD.B.Sir Ludwig Guttmann is an injured soldier.C.Sir Ludwig Guttmann is from Germany.D.Sir Ludwig Guttmann is welcomed by the British.
A.Sir
B.
B.Sir
C.
C.Sir
D.
D.Sir
未分类题
From the passage we may conclude that the writer isA.one of the organizers of the games for the disableD.B.a disabled who once took part in the games.C.against holding the games for the disableD.D.in favor of holding the game for the disableD.
A.one
B.
B.a
C.
C.against
D.
D.in
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