步进电机如果用的是DC5V的脉冲输入信号，目前PLC有DC24V的脉冲输出，应怎么办？（）
A. 并联一个电阻，2K欧，2W
B. 并联一个电阻，1K欧，1W
C. 串联一个电阻，2K欧，1W
D. 串联一个电阻，2K欧，2KW
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数控机床精度检验中，（）是综合机床关键零件部件经组装后的综合几何形状误差。
A. 定位精度
B. 几何精度
C. 切削精度
D. 以上都对
属于面料材料的一组为（）
A. 草棒和高粱秆
B. 牙膏盖和谷物
C. 泥和纸盒
D. 羽毛和树叶
Which two statements are true concerning the Resource Manager plans for individual pluggabledatabases (PDB plans) in a multitenant container database (CDB)?（）
A. If no PDB plan is enabled for a pluggable database, then all sessions for that PDB are treated to an equal degree of the resource share of that pdb.
B. In a PDB plan, subplans may be used with up to eight consumer groups.
C. If a PDB plan is enabled for a pluggable database, then resources are allocated to consumer groups across all PDBs in the cdb.
D. If no PDB plan is enabled for a pluggable database, then the PDB share in the CDB plan is dynamically calculated.
E. If a PDB plan is enabled for a pluggable database, then resources are allocated to consumer groups based on the shares provided to the PDB in the CDB plan and the shares provided to the consumer groups in the PDB plan.
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