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【单选题】
某人血清中无抗A抗B凝集素,红细胞膜无D抗原,其血型属于: A.AB型Rh阴性 B.0型Rh阴性 C.AB型Rh阳性 D.A型Rh阴性 E.0型Rh阳性A.
1
B.
2
C.
3
D.
4
E.
5
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举一反三
【单选题】A number of cars ____ in front of the building.
A.
is parked
B.
are parked
C.
has parked
D.
was parked
【简答题】A number of cars _____ in front of the park. [ ] a. is parked b. was parked c. are parked d. has parked
【单选题】下列说法错误的是( )
A.
PLC设计的核心思想之一是用计算机代替继电器器控制盘
B.
与功能块FB相比较，FC需要配套的背景数据块DB
C.
PLC由输入部分、输出部分和控制器三部分组成
D.
PLC主要由CPU模块、存储器模块、电源模块和输入/输出接口模块五部分组成
【单选题】A number of cars in front of the school gate when there is a parent meeting.
A.
is parked
B.
was parked
C.
are parked
D.
has parked
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