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【多选题】
转基因植物的方法有哪些?
A.
基因枪法
B.
电击法
C.
花粉管通道法
D.
农杆菌介导法
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举一反三
【单选题】关于光纤通信,下列说法正确的是( )
A.
.光在光导纤维中经多次反射从一端传到另一端
B.
.光在光导纤维中始终沿直线传播
C.
.光导纤维是一种很细很细的金属丝
D.
.光信号在光导纤维中以声音的速度传播
【简答题】Once again, I had run away and really did not know why. I walked out of the gate to go to school and then kept walking, and walking, and walking. I was 11years old. It was almost dark; I was tired, co...
【单选题】关于光纤通信,下列说法正确的是( )
A.
所谓光纤通信,就是利用光纤来传输光信息,光的波长没有要求。
B.
所谓光纤通信,就是利用光来传输信息,传输前后不用编码。
C.
所谓光纤通信,就是利用光纤来传输携带信息的光波以达到通信的目的。数字光纤通信系统由光发射机、光纤和光接收机组成。
D.
以上都不对
【多选题】When a passenger’s ticket always comes out from the machine and he cannot go through the gate, , what should a station officer do?
A.
A station officer should come up and check the situation out.
B.
If the passenger’s ticket is overtime, a station office should tell him that according to our company’s regulation you should pay another 8 Yuan.
C.
If the passenger has taken an extra trip, a station office should tell him that you must pay enough money for your trip.
D.
If the passenger has no money to pay for the ticket, a station office should call the police directly.
【单选题】关于光纤通信,下列说法正确的是( )
A.
光在光导纤维中经过多次反射从一端传到另一端
B.
光在光导纤维中始终沿直线传播
C.
光导纤维是一种很细很细的金属丝
D.
光信号在光导纤维中以声音的速度传播
【单选题】关于光纤通信,下列说法正确的是()
A.
光在光导纤维中多次反射从一端传到另一端
B.
光在光导纤维中始终沿直线传播
C.
光导纤维是一种很细很细的金属丝
D.
光信号在光导纤维中以声音的速度传播
【简答题】若有下面说明和定义:struct test{ int m1char m2float m3union uu(char u1[5]int u2[2])ua}myaa 则sizeof(struct test)的值是( )。A)20 B)16C)14 D)9
【简答题】Translate the statements into Chinese.(P53) “Ladies and gentlemen, please form a line and go through the gate one by one.” “Excuse me, but you are not allowed to pass through the gate at the same time...
【单选题】若有定义typedef struct {int n;char ch[8];} PER;以下叙述中正确的是:
A.
PER 是结构体变量名
B.
PER 是结构体类型名
C.
typedef struct 是结构体类型
D.
struct 是结构体类型名
【单选题】若有下面的说明和定义: struct test { int m1; char m2; float m3; union uu {char ul[5]; int u2[2];} ua; }myaa;则sizeof(struct test)的值是( )。
A.
12
B.
16
C.
14
D.
9
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