皮皮学,免费搜题
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搜题
【单选题】
小剂量阿司匹林的抗血栓机制是
A.
抑制磷脂酶A2,使TXA2合成减少
B.
抑制环氧酶,使TXA2合成减少
C.
抑制TXA2合成酶,使TXA2合成减少
D.
抑制酯氧酶,使TXA2合成减少
E.
激活环氧酶,促进PGI2合成
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【多选题】以下不属于关系型数据库产品的是
A.
MySQL
B.
MongoDB
C.
Redis
D.
SQL Server
【简答题】A.He was housed by Emma Thompson five years ago. B.He has graduated from an England university. C.He has become a British citizen. D.He will be 15 years old in April.
【简答题】已知电路如图所示,R 1 =10Ω,R 2 =40Ω,R L =10Ω,L 1 =5H,L 2 =1H,M=0.5H, ,ω=100rad/s,试求 和 。
【单选题】下面的选项不属于关系数据库的性质的是( )
A.
每一列中的分量具有相同的数据类型
B.
不同的列具有不同的数据类型
C.
列的顺序可以调换
D.
行的顺序可以调换
【判断题】因为极限偏差有正负,所以尺寸公差值可以是0或正值。
A.
正确
B.
错误
【单选题】(Even though) Sedat (has been studying) English for three years before he came (to the United States), It is still difficult for him (to express himself).
A.
Even though
B.
has been studying
C.
to the United States
D.
to express himself
【简答题】已知电路如图a所示,U S =48V,R 1 =2Ω,R 2 =R 4 =3Ω,R 3 =6Ω,R L =5Ω,试用戴维南定理求解I O 。
【简答题】根据短文后所给的任务,完成小题. Now the idea of “car sharing” has become popular in Europe and the United States. That’s to say, people share(分享) one car, not each person has one . (65) As we know, most cars are par...
【简答题】已知电路如图a所示,R 1 =1Ω,R 2 =2Ω,R 3 =3Ω,R 4 =4Ω,R L =5Ω,U S =15V,试用戴维南定理求电阻R中的电流I。
【简答题】电路如图所示。已知 RL= 5Ω,试求电路中的电流 I 。
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