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【单选题】
下列式子为重言式的是( )。
A.
p→p∨q
B.
¬(p↔q)
C.
(¬p∧q)∧(p∨¬q)
D.
(p∨q)↔(p→q)
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举一反三
【单选题】locate命令的作用是
A.
显示当前目录
B.
查找用户
C.
显示登录用户
D.
查找文件
【单选题】COVID-19
A.
新型冠状病毒
B.
非典
C.
H1N1
D.
H7N9
【简答题】Writing Practice Please write a composition based on the following outline. COVID-19 1. COVID-19 broke out in China this winter. 2. COVID-19 has landed China into a very tricky situation. 3. People sh...
【简答题】Test for COVID-19 Direction: Listen to a passage about COVID-19 and judge the following questions true or false. And mark T for True or F for False. ( ) 1. Scientists are not sure yet about how dead...
【判断题】Test for COVID-19 Direction: Listen to a passage about COVID-19 and judge the following questions true or false. And mark T for True or F for False. ( ) 1. Scientists are not sure yet about how dead...
A.
正确
B.
错误
【简答题】用locate命令的作用是实现()
【判断题】目前COVID-19的毒力大于流感病毒H1N1
A.
正确
B.
错误
【简答题】locate命令的作用
【单选题】溶菌酶杀灭细菌的作用机理是:
A.
裂解肽聚糖骨架的β-1、4 糖苷键
B.
竞争肽聚糖合成中所需的转肽酶
C.
与核蛋白体的小亚基结合
D.
竞争性抑制叶酸的合成代谢
E.
破坏细胞膜
【简答题】What are the symptoms of COVID-19?
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