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【多选题】
如图所示，A、B是完全相同的两个小灯泡，L为自感系数很大、电阻可以忽略的带铁芯的线圈，则（）A.
电键S闭合瞬间，A、B同时发光，随后A灯变暗，B灯变亮
B.
电键S闭合瞬间，B灯亮，A灯不亮
C.
断开电键S瞬间，A、B灯同时熄灭
D.
断开电键S瞬间，B灯立即熄灭，A灯突然闪亮一下再熄灭
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举一反三
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【简答题】Where should you go if you want to spit? You should spit______.
【单选题】According to the passage, which of the following statements is TRUE?
A.
You should be prepared to make mistakes in communication.
B.
Words are the basis of English learning.
C.
Good pronunciation is important to an English learner.
D.
Wanting to know everything does not help you learn a language.
【单选题】Household pets (infecting) with fleas should (be bathed) weekly (with) a (specially prepared) flee soap.
A.
infection
B.
be bathed
C.
with
D.
specially prepared
【简答题】使用create table命令创建表test,test表共有3列,具体结构如上,创建完成后,使用alter table命令修改该表,将t_age列的可以为空改为不可为空。
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