【单选题】Read the section "Australians Are Scared And Tired." Which sentence from the section shows that the fires may continue to affect the planet even after they are put out?
A.
That amount of land is equal to the burning of the entire state of West Virginia.
B.
Smoke from the fires has made it to South America.
C.
There is so much smoke that it may stay in the air for months.
D.
She said there is a signal that warns people to leave.
【判断题】2在一个SELECT语句中,不可能包含有另一个SELECT语句。
【判断题】Java的各种数据类型所占用的内存长度与具体软硬件环境有关
【单选题】英国著名教育家斯宾塞从知识的“实际效用”出发,主张通过“自由竞争”达到“适者生存”,而教育的目的就是为“完美的生活做准备”。在他看来,能实现“完美的生活”最有价值的知识是()。
【单选题】英国著名教育家斯宾塞从知识的“实用效用”出发,主张“自由竞争”“适者生存”,认为教育的目的就是“为完美的生活做准备”。在他看来,能实现“完美的生活”的最有价值的是( )知识。
【判断题】1在一个SELECT语句中,不可能包含有另一个SELECT语句。
【单选题】A) She was too tired to continue. B) It was hard for her to run on the wetsand. C) She didn’tlike the volleyball . D)She couldn’t bear the burning hot weather.
A.
She was too tired to continue.
B.
It was hard for her to run on the wetsand.
C.
She didn’tlike the volleyball .
D.
She couldn’t bear the burning hot weather.
【单选题】某线性DNA分子含有5000个碱基对(bp),先用限制性核酸内切酶a完全切割,再把得到的产物用限制性核酸内切酶b完全切割,得到的DN段大小如下表所示。限制性核酸内切酶a和b的识别序列和切割位点如图所示。下列有关叙述错误的是( ) a 酶切割产物 (bp ) b 酶再次切割产物 (bp ) 2100 ; 1400 ;1000 ; 500 1900 ; 200 ; 800;600 ; 1000 ...
B.
限制性核酸内切酶a和b切出的DN段不能相互连接
C.
该DNA分子中含有被a酶识别的碱基序列有3处
【判断题】9在一个SELECT语句中,不可能包含有另一个SELECT语句。