皮皮学，免费搜题
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【单选题】
与低温环境相比,在常温条件下,碳钢的性能有所变化。关于以下结论,正确的是( )。A.
强度提高、塑性降低;
B.
强度降低、塑性提高;
C.
强度、塑性都提高;
D.
强度、塑性都降低。
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【判断题】当计算机向RFID读卡器发送CMD字段为0x21的命令包时,RFID读卡器将进行集成寻卡，防冲突，选卡，验证密码，读卡等操作，一个命令完成写数据块操作。
A.
正确
B.
错误
【多选题】提升幼儿歌唱的表现力我们要做到:
A.
为幼儿传授演唱的方法，奠定表现基础
B.
为幼儿提供更多的表现机会，让幼儿自由表演
C.
鼓励幼儿在活动中积极演唱
D.
鼓励幼儿在生活中大胆歌唱
【简答题】ABS 是指在汽车()中,防止车轮被完全()。
【单选题】You need to perform certain data manipulation operations through a view called EMP_DEPT_VU, which you previously created. You want to look at the definition of the view (the SELECT statement on which ...
A.
Use the DESCRIBE command in the EMP_DEPT VU view.
B.
Use the DEFINE VIEW command on the EMP_DEPT VU view.
C.
Use the DESCRIBE VIEW command on the EMP_DEPT VU view.
D.
Query the USER_VIEWS data dictionary view to search for the EMP_DEPT_VU view.
E.
Query the USER_SOURCE data dictionary view to search for the EMP_DEPT_VU view.
F.
Query the USER_OBJECTS data dictionary view to search for the EMP_DEPT_VU view.
【单选题】You need to perform certain data manipulation operations through a view called EMP_DEPT_VU, which you previously created. You want to look at the definition of the view (the SELECT statement on which ...
A.
Use the DESCRIBE command on the EMP_DEPT_VU view.
B.
Use the DEFINE VIEW command on the EMP_DEPT_VU view.
C.
Use the DESCRIBE VIEW command on the EMP_DEPT_VU view.
D.
Query the USER_VIEWS data dictionary view to search for the EMP_DEPT_VU view.
E.
Query the USER_SOURCE data dictionary view to search for the EMP_DEPT_VU view.
F.
Query the USER_OBJECTS data dictionary view to search for the EMP_DEPT_VU view.
【判断题】当计算机向RFID读卡器发送CMD字段为0x20的命令包时,RFID读卡器将进行集成寻卡，防冲突，选卡，验证密码，读卡等操作，一个命令完成读数据块操作。
A.
正确
B.
错误
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