皮皮学,免费搜题
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【简答题】
请根据地图路线给你的好朋友留言,告诉他如学校到你家。 Ride along, in front of, the second crossroads, at the first turning, beside, turn left, go straight, on your right, opposite to If you want to go to my home by bike, first, _________________1). Turn right __________________2). __________________3) the road and turn right at ______________4). Then __________________5) at the first crossroads. My home is ________6). It’s just ________ 7) the post office, ____________8) the bank. If you want to go by bus, you can take No. 2 bus. The bus stop is just _______________9) the book store. 选项: A. go straight B. at the first turning C. on your right D. the second crossroads E. turn left F. in front of G. Ride along H. opposite to I. beside
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皮皮学刷刷变学霸
举一反三
【单选题】下列选项中,能够实现预编译的是
A.
Statement
B.
Connection
C.
PreparedStatement
D.
DriverManager
【多选题】结构失效的常见表现形式:
A.
破坏
B.
失稳
C.
过大变形
D.
倾覆
E.
锈蚀腐烂冻融
【简答题】已知复数z 0 =3+2i,复数z满足z·z 0 =3z+z 0 ,求复数z和|z|。
【简答题】(1)已知Z是复数,求证:① |Z| 2 =Z? . Z ;② . Z- . Z = . Z -Z ; (2)已知z 1 ,z 2 是复数,若|z 1 - . z 2 |=|1-z 1 z 2 |,求证:|z 1 |,|z 2 |中至少有一个值为1.
【单选题】z是纯虚数的一个充要条件是(  )
A.
z+ . z ≠0
B.
z- . z ≠0
C.
z? . z ≠0
D.
. z =-z(z≠0)
【简答题】设z= 1 2 + 3 2 i ,那么z+z 2 +z 3 +z 4 +z 5 +z 6 =______.
【简答题】已知z∈C,下列各式中成立的是______.(填序号) ① |z | 2 =z? . z ; ②|z| 2 =z 2 ; ③z 2 ≥0; ④ . z 1 - z z =| z 1 |-| z 2 | ; ⑤|z 1 ?z 2 ?…?z n |=|z 1 |?|z 2 |?…?|z n |; ⑥|2-3i|>|1-3i|.
【简答题】若复数z满足: z+ . z =2 , z? . z =2 ,则 |z- . z | =______.
【简答题】设z的共轭复数是 . z ,若z+ . z =4,z? . z =8,则|z|=______.
【单选题】给出下列四个命题: ①若z∈C,|z| 2 =z 2 ,则z∈R; ②若z∈C, . z =-z ,则z是纯虚数; ③若z∈C,|z| 2 =zi,则z=0或z=i; ④若z 1 ,z 2 ∈C,|z 1 +z 2 |=|z 1 -z 2 |则z 1 z 2 =0.其中真命题的个数为(  )
A.
1个
B.
2个
C.
3个
D.
4个
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